Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5b47d55c29e38e…

MALICIOUS

PDF

113.0 KB Created: 2021-04-19 05:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b6b2f08d8f70f78d8b784fe6ece2b3b4 SHA-1: fb728a2d8e7ee39219c8c5b4e6f841450c75a994 SHA-256: bc5b47d55c29e38e1436d554af2f67b27c2ceb6ad7262638a353ec307f17513c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, including one pointing to 'dugedepap.ru', suggesting it's used for SEO spam or to redirect users to potentially harmful content. The document body, though partially corrupted, contains text related to 'biological psychology' and authoring information, likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dugedepap.ru/strik?utm_term=why+is+it+important+to+study+biological+psychology PDF link annotation
    • http://rumurel.mywebcommunity.org/3771423886.pdfIn PDF document text
    • http://dexaputanit.mygamesonline.org/gizawabawekovox.pdfIn PDF document text
    • http://gojawufeki.getenjoyment.net/wusenav.pdfIn PDF document text
    • http://fejavodexata.getenjoyment.net/98329493600.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_582dfb046007441296f5e33f2998d2da.pdf?index=trueIn PDF document text
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_8bf66ad68c844e75ac8910ef0c85c6ed.pdf?index=trueIn PDF document text
    • http://muvekalufisu.atwebpages.com/siwumufasozon.pdfIn PDF document text
    • https://9b321a86-0615-40a7-b684-6dced782f4cc.filesusr.com/ugd/e3cae3_2fcc6120ee4a4bae97e3bab1981d8acf.pdf?index=trueIn PDF document text
    • https://bfb79b04-db4d-4c54-a74a-4733ff68ceb9.filesusr.com/ugd/11291b_5512c486de274d4c86b62feee2de1d75.pdf?index=trueIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_c7c6ab0368864795b03e33390ba011ea.pdf?index=trueIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_63eca131be894839ac6aede786727afe.pdf?index=trueIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_92d1bbf033134c99a66f48b682d1a77c.pdf?index=trueIn PDF document text
    • http://vilumepidiwego.myartsonline.com/72646572384.pdfIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_802bda770bf34ad6b7a5a85a172a7155.pdf?index=trueIn PDF document text
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_980252d601d5487abab4d69e84db49c8.pdf?index=trueIn PDF document text
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_1d2600d3956f49299cde0a9f6dec1837.pdf?index=trueIn PDF document text
    • http://mojenuj.atwebpages.com/zowomugobanuvofof.pdfIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_e8579dbffa1b4d83a5cf843a23e7c186.pdf?index=trueIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_3a0bb27cc7084c1daffd95f7ab6c108d.pdf?index=trueIn PDF document text
    • https://da6a6a96-7907-4aac-bfe3-592928b14ca9.filesusr.com/ugd/39e844_a2ba771baa014d9e9af92c2845171620.pdf?index=trueIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_39a813b3a6dd44dba3f1fd515209357b.pdf?index=trueIn PDF document text
    • https://f646ef88-00e6-4551-89fe-45f5af5e8efa.filesusr.com/ugd/87b9a8_d97f3a5a54664d149068b2b2c1c65a6f.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001543f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1543F 4880 bytes
SHA-256: feabc156dacbd3f331f94104dc0c47e6437f27175d86cb5b1e2cf8924492e968
font_01_sfnt_off00016522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16522 5744 bytes
SHA-256: 0ac4ab6b0cdba17cae214fbdcbdf21c2ba31c1e68cccfc004672f147a7120766
font_02_sfnt_off00017895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17895 11708 bytes
SHA-256: 0c539de64bf2f914bc08a3af706a5388183cc71c49774302e99f21fd317a801d
font_03_sfnt_off0001a085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A085 16192 bytes
SHA-256: 296b33a6e69ac3fa8ed420f1d1b401a0712a5a108b7c5c6efc73671719323d57

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