Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76da37ee1db2ac3…

MALICIOUS

PDF

78.2 KB Created: 2021-04-05 23:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79aabdd4876284551da1ca39290294de SHA-1: dd16fc929dcda14f05874ac86b03ff73306c1d12 SHA-256: e76da37ee1db2ac30d282d0077bbbad6b7e26a37f97e5d091d0ecff775ce4b9d
156 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous external links, a common tactic for distributing malware or conducting phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs, including a link farm heuristic, suggests the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/123?utm_term=blacksmithing+leveling+guide+1-+450
    • http://jirafka.space/89889388360waqwh.pdf
    • http://testrun.ru/autolink_al319_how_to_read_codessxymb.pdf
    • https://static.s123-cdn-static.com/uploads/4368238/normal_5ff96bb25e098.pdf
    • http://finomimetafix.sportsontheweb.net/zasagelupowuxovimejaj.pdf
    • http://osummer.space/6824593020421koh.pdf
    • http://zaxiluxedexu.getenjoyment.net/98699232878.pdf
    • https://cdn-cms.f-static.net/uploads/4425759/normal_600b65932880e.pdf
    • https://cdn-cms.f-static.net/uploads/4380540/normal_606640b9d1aac.pdf
    • http://toworugesolur.getenjoyment.net/69039891246.pdf
    • https://cdn-cms.f-static.net/uploads/4381081/normal_602d8dc3376ee.pdf
    • https://cdn-cms.f-static.net/uploads/4476133/normal_6055364e1aee4.pdf
    • http://jarewitof.mypressonline.com/66078151116.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/voxazedisula/25054546998.pdf
    • https://s3.amazonaws.com/jevelel/chemical_reaction_and_equations.pdf
    • https://s3.amazonaws.com/gelawiweza/gafagibuven.pdf
    • https://s3.amazonaws.com/zagapaxa/heart_sounds_ppt.pdf
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_132cca9b34c644fbb1cc841e73c4fb8f.pdf?index=true
    • https://s3.amazonaws.com/xisakazelelinim/30499596104.pdf
    • https://s3.amazonaws.com/luxaduzimase/18544055011.pdf
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_568a67bbdef540299bb9bfaf14efded3.pdf?index=true
    • https://s3.amazonaws.com/runuzitexokol/music_sheets_for_beginners.pdf
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_ba827d15ca0c417f9607d7fd4026c5a6.pdf?index=true
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_7dd76a69965c4637b8d13a49518ab916.pdf?index=true
    • https://s3.amazonaws.com/zumomasugipeno/wumime.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3b2.bin
b1ff34d1efd99178ff31e215c24c991bf904d5ef2fb4576112985fc2b0befdb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B2 5868 bytes
font_01_sfnt_off000107ac.bin
a27d8198fa1ec9e8d1465b85e10eccce45762a0d7243879f2648a32cf34fc465		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107AC 10436 bytes

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