Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b9ccdf716e14cb…

MALICIOUS

PDF

78.5 KB Created: 2021-03-05 11:37:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 3f981d8e9b0ab5dc1ba7d4bd9b0c860a SHA-1: 6f1562e7ad567c30f0df3f0d9f6ab7c4cb0504bd SHA-256: a1b9ccdf716e14cb3042b2da3c67ed8724e9d96c8a515a94b4a4e470513960aa
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous external URLs that likely lead to malicious content or further infection stages. The heuristic 'PDF_SEO_LINK_FARM' strongly suggests a deliberate attempt to create a large number of links, potentially for SEO manipulation or to distribute malware across many domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=how+to+start+with+calculus PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375194/normal_6030dbe8b23dd.pdfIn PDF document text
    • http://pemutoguxo.66ghz.com/16365390815.pdfIn PDF document text
    • https://dewanuraxode.weebly.com/uploads/1/3/4/3/134324700/6796166.pdfIn PDF document text
    • https://nogetutiru.weebly.com/uploads/1/3/4/7/134711470/15d157600baf6bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380527/normal_602649190222d.pdfIn PDF document text
    • https://kunamugak.weebly.com/uploads/1/3/0/7/130739026/9701044.pdfIn PDF document text
    • https://wewogubebomev.weebly.com/uploads/1/3/4/6/134692169/96005665ad81.pdfIn PDF document text
    • http://dipukud.iblogger.org/artisan_1430_wifi_connection.pdfIn PDF document text
    • https://kogafisefog.weebly.com/uploads/1/3/1/4/131438876/1376289.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408984/normal_5ff92ce0172e6.pdfIn PDF document text
    • http://salunavotofez.22web.org/tolaguwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459631/normal_6009bf7a93ef6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/phishing_email_report_button.pdfIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_e05e2820926b43b18b10cfb1cc85796f.pdf?index=trueIn PDF document text
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_3dfc9fc75e7b45b3944dfbcecec182e5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/ramakevimosekexumewa.pdfIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_4a935b290bf044cebef3d15b38235df4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevelel/5287515862.pdfIn PDF document text
    • https://36071b1a-d853-4ad1-bccf-0ed894d94038.filesusr.com/ugd/906e9f_0f41aea3f9ed41949970c1126d532914.pdf?index=trueIn PDF document text
    • https://6ba7316d-b84b-4ccb-a32a-103c856d4013.filesusr.com/ugd/91f37e_ca5f8bf3f5924426a6e1602f63c90e3c.pdf?index=trueIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_68d93b8f7f514204965dfb30000a649a.pdf?index=trueIn PDF document text
    • http://sigukelebejewir.epizy.com/60349828836.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/battle_net_not_working.pdfIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_71e5be6da6ef421daa29461a50c0ea49.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 4940 bytes
SHA-256: dd1dde32b201f6b7b4dc4dd4d4fbac6bebea4af0cfa1b5a5bd89130092c4fc02
font_01_sfnt_off000107c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C3 10892 bytes
SHA-256: b52416f8e921c2adc791b71ad21001f6e34853a814bffcd843a2e94be1956c7c