Malicious PDF — malware analysis report

Static analysis result for SHA-256 907768cd71846741…

MALICIOUS

PDF

80.4 KB Created: 2021-03-05 13:14:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 36d87df548d9b722a3c5884db50ab57b SHA-1: 6d4e6c8ce126657e8d8a73d66c4aa38e3fc8b132 SHA-256: 907768cd718467417202d9a78b9bae7da33307468c67dcbf8f31b221abb1a2c0
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, and detected by ClamAV as Pdf.Phishing.Trojan. The document contains a large number of external links, many hosted on disposable domains, forming a link farm. The primary URL points to a page with a keyword related to 'small freezers', suggesting a deceptive lure to drive traffic to these link farms. No scripts were extracted, but the overall structure and link farm behavior are indicative of a phishing or ad-revenue generation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://kuzutuzo.ru/award?keyword=which+small+freezer+is+best PDF link annotation
    • http://trikotoria.ru/cch_chnh_ng_h_xe_attila_venusc7h7r.pdfIn PDF document text
    • https://zegokovoni.weebly.com/uploads/1/3/4/3/134323662/buzazaken.pdfIn PDF document text
    • https://zusikoxapumobib.weebly.com/uploads/1/3/4/7/134766975/lewowaniviza_sevomogub.pdfIn PDF document text
    • https://taxajoberaruvu.weebly.com/uploads/1/3/4/3/134320235/sadawuwilito.pdfIn PDF document text
    • http://gk-kuban.ru/how_long_is_the_forever_21_sale37tqj.pdfIn PDF document text
    • https://sulefufevonabu.weebly.com/uploads/1/3/4/3/134363738/2480a.pdfIn PDF document text
    • https://nurosizakudagag.weebly.com/uploads/1/3/4/6/134699554/gokidarumojami_rebudakukifad_dufolefidadoge_bababopidiwu.pdfIn PDF document text
    • https://kadukutinebi.weebly.com/uploads/1/3/4/7/134747046/dfc4c9b9ad526.pdfIn PDF document text
    • https://galanopudaxu.weebly.com/uploads/1/3/4/1/134109153/tizaj.pdfIn PDF document text
    • https://kulojimafad.weebly.com/uploads/1/3/4/5/134518235/d89f3a0180.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://waromewozepivo.rf.gd/52039005550.pdfIn PDF document text
    • https://e18e6c05-101e-4f41-9c4d-f518aea09dbb.filesusr.com/ugd/7972b3_388deabc7e86433291ebdc75ae48194c.pdf?index=trueIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_fa560f6a5acd4230acc36fa0946d448c.pdf?index=trueIn PDF document text
    • http://jekewakus.epizy.com/74597357784.pdfIn PDF document text
    • http://dunupilopun.epizy.com/6583000375.pdfIn PDF document text
    • http://zefumegidadaj.epizy.com/januvia_medication_guide.pdfIn PDF document text
    • http://dakokaxawizepu.epizy.com/vivetabepebokefinadevivo.pdfIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_100fc91945c5487f82bb82fef88463f1.pdf?index=trueIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_1ce8a3afca0e497884cc9774542eb4e6.pdf?index=trueIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_d2522ab50d574ffbb339962ee2a89fee.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_off0000fd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD56 5324 bytes
SHA-256: ec6e3acc66cda65336b14e5bcd85e26967ab57fed38da4ee8dd1a06ca87a2203
font_01_sfnt_off00010f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F60 11060 bytes
SHA-256: 51f453d34eb06d96ecd2be3d7d10844d492eb9d707e23bf578b09002b3335512