Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b3a02ee9be95d5…

MALICIOUS

PDF

83.8 KB Created: 2021-03-29 12:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 73272466bfe18e7ab212a075ae7b1447 SHA-1: 9c479632fe0b168ec87eb100e4aa913a354363c3 SHA-256: a0b3a02ee9be95d52a3f2b53cc2c232d6d09ab5fad7ce8070c3835140f3eca59
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spamming tactic. The 'Dork diaries 12 pdf free download' text in the document body, combined with the PDF_SEO_LINK_FARM heuristic, indicates a lure to trick users into visiting potentially malicious sites. ClamAV also detected this as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=dork+diaries+12+pdf+free+download PDF link annotation
    • http://kudusakepupa.sportsontheweb.net/kettlebell_core_exercises.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402247/normal_600306d3a555f.pdfIn PDF document text
    • http://muvepifare.mygamesonline.org/secrets_of_the_temple_slot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379612/normal_604bc48ad6ea0.pdfIn PDF document text
    • http://dodemul.mygamesonline.org/7042227601.pdfIn PDF document text
    • http://fepemewavitik.66ghz.com/davidorifisosonexik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471688/normal_60394af10dfbe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417422/normal_5fcf2ca00bc7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368767/normal_603a8ab006a8a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gonatiw.rf.gd/autel_autolink_al319_obd_ii_manual.pdfIn PDF document text
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_76fe7a67a8b34cb9b9d788bf70a92c18.pdf?index=trueIn PDF document text
    • https://8f1ef4f7-3f23-41ef-a3d6-4e5873a175a2.filesusr.com/ugd/d318ce_278a7e0a54444e159a86210f3dec2b74.pdf?index=trueIn PDF document text
    • http://pegufokaki.epizy.com/vonixamodifod.pdfIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_a2d507597eae4b358da5f7392b0193b6.pdf?index=trueIn PDF document text
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_89710d7554e547aabc1828662463f7a6.pdf?index=trueIn PDF document text
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_fa8fa2271367453f8daf0b06a74dc6ef.pdf?index=trueIn PDF document text
    • https://7e70056c-c2aa-4e53-98c5-50750123c107.filesusr.com/ugd/f8ae5d_e6689598b33d474694a0173f9f421536.pdf?index=trueIn PDF document text
    • https://2e4b0ed6-c237-476e-b23b-7c95f147629f.filesusr.com/ugd/30e930_5f9c60731ac14f83838802ea8014561e.pdf?index=trueIn PDF document text
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_8185519440f94394a7a4fb8bd86990c5.pdf?index=trueIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_1ce3cc79134c4275b745c481973536cc.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_off000105cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CB 5372 bytes
SHA-256: b78830d7209abfa7c7505c6d41a576118223c4f8f3146bf4f5519572d6380275
font_01_sfnt_off00011842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11842 11864 bytes
SHA-256: 84d28394eb52cca6b39272e171089905db134e48f80b640b2c469ffe2bc9f3d3