Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb9461384a06b92…

MALICIOUS

PDF

80.1 KB Created: 2021-04-03 11:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3b3f9e903bc597cce634d8dc0543550 SHA-1: 197c1dc29751e58c3da700cfd0b12cb7f04a93bb SHA-256: abb9461384a06b9291ef36ee003757df133ef9bc5657503a313af8e8183f0828
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with the primary one being a lure for a 'calculus book pdf'. This suggests a link farm or SEO spam tactic to drive traffic to potentially malicious sites. ClamAV and ML heuristics confirm its malicious nature, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=calculus+book+pdf
    • https://vozupawugenebib.weebly.com/uploads/1/3/0/7/130776609/wanuwubesexer-ninave-xelokijuwup.pdf
    • https://cdn-cms.f-static.net/uploads/4371806/normal_602428bb76803.pdf
    • https://jegivobepumo.weebly.com/uploads/1/3/4/4/134444156/3750783.pdf
    • http://sazasebum.iblogger.org/bodhankar_book.pdf
    • https://mizavuzozubex.weebly.com/uploads/1/3/4/7/134730625/jigabimigofi.pdf
    • https://static.s123-cdn-static.com/uploads/4486220/normal_5feb7ec3ef3fc.pdf
    • https://jaroxifapo.weebly.com/uploads/1/3/1/6/131636664/7311646.pdf
    • https://tipowunukal.weebly.com/uploads/1/3/4/3/134355136/fupix-nugirasen-fikiwuzet-fepixej.pdf
    • https://junenewawaxi.weebly.com/uploads/1/3/1/4/131407408/d58c8799d.pdf
    • https://cdn-cms.f-static.net/uploads/4419002/normal_6045f4b590381.pdf
    • https://cdn-cms.f-static.net/uploads/4403952/normal_60298ad640613.pdf
    • https://jitaginedisa.weebly.com/uploads/1/3/4/3/134324559/bakanib.pdf
    • https://bujozimadepaxed.weebly.com/uploads/1/3/4/6/134615651/470906.pdf
    • http://gupirod.iblogger.org/andhra_bank_personal_loan_application_form.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/poresi/how_to_make_semi_permanent_hair_dye_fade_fast.pdf
    • http://xuxekup.rf.gd/ocarina_of_time_nintendo_guide.pdf
    • https://s3.amazonaws.com/vososasoxumete/vobapazubomobifodifara.pdf
    • https://s3.amazonaws.com/tesodagiwor/tor_browser_vpn_free.pdf
    • https://s3.amazonaws.com/pidufozu/mebuvipexa.pdf
    • https://s3.amazonaws.com/sojenozap/what_are_some_words_that_start_with_sat.pdf
    • https://s3.amazonaws.com/kudufigunabi/wifisokidamofonubakowo.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_off0000f972.bin
0ab294e2bb3fee34974fa91f7a1ee5237978b05d4b0ea0491684acd054b06096		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF972 5164 bytes
font_01_sfnt_off00010b0f.bin
0b8017e68d0fd17f88080968de50d40c0ba22ca2e4da3550de10b366e387a13b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0F 12024 bytes

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