Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3952fa716511dd…

MALICIOUS

PDF

83.8 KB Created: 2021-03-28 04:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52579c3e48e8b8dd079f3968ad150c7f SHA-1: 7cceb9794282ec2ace62d711b9558380feb9b1ea SHA-256: bf3952fa716511dd72e34ea4159a8b75ba430d068b3b19ba1a35ddff56ccca93
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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 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://jumiwimov.ru/wix?keyword=patagonia+wetsuit+size+guide
    • http://bukuxojunuz.mypressonline.com/talovowulikodukur.pdf
    • http://bomisedoxu.mywebcommunity.org/wigozogu.pdf
    • https://xovazarorofo.weebly.com/uploads/1/3/4/4/134457653/rumunimanapi.pdf
    • http://dokaxirugik.medianewsonline.com/online_web_page_to_maker.pdf
    • https://gubuwogufulero.weebly.com/uploads/1/3/4/6/134608521/8207245.pdf
    • http://motorutovibipe.sportsontheweb.net/catecismo_iglesia_catlica.pdf
    • http://balegetiwep.mywebcommunity.org/jarupegilapuro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/826d7d44-fb84-436c-b907-93ad0cf22d33/marotamodujojagibo.pdf
    • http://xovolefewawex.atwebpages.com/wps_to_word_converter_mac.pdf
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_857e083b446749f3a002beac55ca7467.pdf?index=true
    • https://uploads.strikinglycdn.com/files/37e50cb6-4be0-4849-a5da-bce8a9031e65/24155331839.pdf
    • https://da6a6a96-7907-4aac-bfe3-592928b14ca9.filesusr.com/ugd/39e844_245fc18440774c618ec454759dea1c3d.pdf?index=true
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_325941d6e365430fa76cbf5b769f9f4f.pdf?index=true
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_b48a957a106f4669aae53acad267fab0.pdf?index=true
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_3dcc0fb37dd84e01b825c1bab099e943.pdf?index=true
    • https://f7e05ffc-afae-4d19-be15-7e9c659e5e5f.filesusr.com/ugd/72f62b_88703a54225743bdae5eecd8edb0f9d8.pdf?index=true
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_1162cc9b2796479788526ac700090b37.pdf?index=true
    • https://uploads.strikinglycdn.com/files/aafd5e80-6fa9-44a0-8309-431f7ee92950/maytag_dishwasher_mdb4949sdm2_troubleshooting.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9b7.bin
65dd0d6b82be9bb59ee8adbecd94b4628377f122808ae1cfdddca05dbdc51ed0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B7 5008 bytes
font_01_sfnt_off0000fae7.bin
a2c472db5c27749518c806e171d948a538666bd9896fa5d0c22d6e92b8488242		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE7 2016 bytes
font_02_sfnt_off00010440.bin
2a98d4fc5f3d3cd43db55109321307c4ec799896f5528a86baffd03482bb60bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10440 11044 bytes
font_03_sfnt_off000129ee.bin
b5fbaaa4af9b36882f9d831a885ef238a37545ab26d417bac7d8f56cddfd7376		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129EE 16328 bytes

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