Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d616a8a66c64d4…

MALICIOUS

PDF

86.8 KB Created: 2021-04-06 15:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d47261118926d666974e187e65da7714 SHA-1: 7cee356a1f1ccb8db8d72dab88933f70a3c24d85 SHA-256: d7d616a8a66c64d4b70e0395de6e2695a4363cbb12e1657f7b8b7e7e8f7f706e
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly suggest an attempt to lure users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kuzutuzo.ru/strik?utm_term=uncle+tom%2527s+children
    • https://tejekukukageza.weebly.com/uploads/1/3/4/6/134662245/2177989.pdf
    • https://zosumomaxin.weebly.com/uploads/1/3/4/0/134040430/xevawapifusoxo.pdf
    • https://cdn-cms.f-static.net/uploads/4465262/normal_6043603684873.pdf
    • https://cdn.sqhk.co/wirubetena/hjhdPiq/30280144434.pdf
    • https://cdn-cms.f-static.net/uploads/4489834/normal_5fd29fc785f38.pdf
    • https://kelubipo.weebly.com/uploads/1/3/4/8/134891634/2057955.pdf
    • https://cdn.sqhk.co/fakobijo/gdjclja/pottery_barn_christmas_decorations_outdoor.pdf
    • https://cdn.sqhk.co/tolebilu/oge6geI/43537339674.pdf
    • http://nibobokil.66ghz.com/18596445555.pdf
    • https://wejumarokurefa.weebly.com/uploads/1/3/0/7/130776247/nevadat-lupin-tewemixeriva.pdf
    • https://static.s123-cdn-static.com/uploads/4414688/normal_5fcef5b5d9c64.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_4a2c1fdc833f46e2a7a6487cbd9b98f1.pdf?index=true
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_a4a67068af0c4edebc84d9def23fc6dd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0c9a864d-04d8-4312-be81-a08894a83d35/zekagutoxalifino.pdf
    • https://uploads.strikinglycdn.com/files/42833298-6b11-4460-8f81-15adf386d9c8/sofakupebufa.pdf
    • https://ef90beaa-bca2-431e-862c-49c19dd94618.filesusr.com/ugd/06497e_52e5d2a9677a412fb40412f0d1d16264.pdf?index=true
    • https://uploads.strikinglycdn.com/files/79d26088-a287-4c94-a0d7-13cb92eaf380/ap_style_percent_in_headlines.pdf
    • http://jemukibupafezov.rf.gd/english_book_8_class.pdf
    • http://sivinufedumoja.rf.gd/entrepreneurship_development_book_download.pdf
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_8c65d8eace4141ceaa09bbbc9b822751.pdf?index=true
    • http://gezexibubaju.rf.gd/bivukezabodimupemolow.pdf
    • https://uploads.strikinglycdn.com/files/f066a410-f689-4b68-b805-05b1a8a0e0bd/osha_safety_videos_2019.pdf
    • http://rinexijirava.rf.gd/captain_america_300mb_full_movie.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e5c.bin
217b11fa57083b14cf572869f7609ea1caff8f395bb1225c6d349375b7bf33d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5C 4996 bytes
font_01_sfnt_off00011f2d.bin
6fc9a4505c6780065ade8ec307afb6c240308c2f106507ecaf7121fd5f057755
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2D 1876 bytes
font_02_sfnt_off0001285e.bin
e59381ac429998897fa10941a4e635dabcd74e1ddae757fbbca8658b81aa8e33
pdf-font-stream PDF embedded font (sfnt) at offset 0x1285E 10664 bytes