Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9800f7e1475ffb…

MALICIOUS

PDF

79.9 KB Created: 2021-05-20 03:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a80f2fc90089db75668ec2bd7a0a016 SHA-1: cf80a1a730bae0b7c963b0e2292908673b81ca63 SHA-256: ab9800f7e1475ffbf7403bbc79360ec3e6e01baa691c5fc87ad26b087dacc702
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mezovuduw.ru/strik?utm_term=things+i+wish+i+had+known+before+marriage
    • https://muluxadi.weebly.com/uploads/1/3/1/4/131453645/mesumokizezaj.pdf
    • https://togazozaxezux.weebly.com/uploads/1/3/1/6/131606461/walun.pdf
    • https://kazigujexumakul.weebly.com/uploads/1/3/4/3/134320364/4aaf1276c.pdf
    • https://jerefukixuludew.weebly.com/uploads/1/3/4/6/134686450/zakusekupiguvoker.pdf
    • https://fekugutupufug.weebly.com/uploads/1/3/4/8/134876907/fee2fb4c4.pdf
    • https://rifijilaguselud.weebly.com/uploads/1/3/4/8/134846829/jomafar-zorev.pdf
    • https://kosukanawator.weebly.com/uploads/1/3/5/3/135304621/6a09852de.pdf
    • https://metifavogogebo.weebly.com/uploads/1/3/4/7/134716609/dimazi.pdf
    • https://zatuzura.weebly.com/uploads/1/3/1/4/131453499/4fe98cc4337005.pdf
    • https://remejatezikame.weebly.com/uploads/1/3/1/0/131070309/rofibuk.pdf
    • https://woxopipuwesubaj.weebly.com/uploads/1/3/1/4/131453061/xisezizipozef.pdf
    • https://sojetupeduxagi.weebly.com/uploads/1/3/1/8/131856567/126fe489f.pdf
    • https://nibuzexo.weebly.com/uploads/1/3/4/7/134720699/kexugak-xesatexevik.pdf
    • https://semufukat.weebly.com/uploads/1/3/1/8/131857602/2161020.pdf
    • https://kodopikowi.weebly.com/uploads/1/3/4/6/134659436/36c7490d89.pdf
    • https://werumitepoli.weebly.com/uploads/1/3/0/7/130739038/d67378fd4.pdf
    • https://goponubinolofuv.weebly.com/uploads/1/3/4/6/134695307/f2a6ee308043cba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pigolo/balobineb.pdf
    • https://s3.amazonaws.com/mejigavukolu/lufifobe.pdf
    • https://s3.amazonaws.com/lanubili/36656083616.pdf
    • https://uploads.strikinglycdn.com/files/b3d7fc7d-083a-4e6c-b0d8-1b2e4619ba8e/binodurubidesuforubobuji.pdf
    • https://uploads.strikinglycdn.com/files/de3084d8-4d8d-4810-b732-8a5f050b597e/how_to_find_out_which_breed_of_dog_is_best_for_you.pdf
    • https://uploads.strikinglycdn.com/files/deb01acb-3475-4940-91eb-845c7aef4cbe/nukuzetuwukutotemobojep.pdf
    • https://s3.amazonaws.com/ponivotigegepub/39849408274.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_off0000f5b0.bin
3fe395ba65b26815902bd82bbec19e687840e00d7aced68ef93de8f674451e45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B0 5532 bytes
font_01_sfnt_off0001086c.bin
1180e3e7442cd5cfe468d22b1adab0a4ee295408f0dff5e449b481111cc9e433		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1086C 12016 bytes

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