Malicious PDF — malware analysis report

Static analysis result for SHA-256 7682cbc5b8262370…

MALICIOUS

PDF

83.3 KB Created: 2021-06-01 12:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 346cd16bf5ecbb571f5e4780689853d0 SHA-1: 285cc3f4551e36eded7ac2c31dc86097fa77ea5d SHA-256: 7682cbc5b8262370e3357b3cd01423335b64de9fcc7384773def96a8b3c144f8
194 Risk Score

Malware Insights

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

The PDF file contains a mass of external links, identified as a link farm. Several heuristics indicate this behavior, including 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV also flagged the file as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the nature of the link farm suggests a phishing or malicious redirection attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://archism.ru/pbw?utm_term=cinderella+man+viewing+questions+answers PDF link annotation
    • https://tazorigebug.weebly.com/uploads/1/3/4/7/134766075/xevemadakokuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416321/normal_5feec3b601b17.pdfIn PDF document text
    • https://vatenesarawe.weebly.com/uploads/1/3/0/7/130775606/nibedamoji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388050/normal_60672ce279016.pdfIn PDF document text
    • https://lefatelaxebaj.weebly.com/uploads/1/3/5/3/135398996/1ab400.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410441/normal_606debdf8b377.pdfIn PDF document text
    • https://zexiditituluw.weebly.com/uploads/1/3/4/7/134734655/92284e01.pdfIn PDF document text
    • https://xixiduduge.weebly.com/uploads/1/3/4/7/134713202/2233438.pdfIn PDF document text
    • https://werotibumef.weebly.com/uploads/1/3/4/9/134900185/563c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488806/normal_602d3d9874a01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419195/normal_600b21aaaf5d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370273/normal_6062c39fe3d25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_606e3151cfc3c.pdfIn PDF document text
    • https://birijejukuz.weebly.com/uploads/1/3/5/3/135386669/6005498b167b5.pdfIn PDF document text
    • https://sotezogurew.weebly.com/uploads/1/3/2/7/132740991/mejesuj.pdfIn PDF document text
    • https://fofevupug.weebly.com/uploads/1/3/4/4/134490210/vupedutujadu_gumevitewuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d391cc8-7192-4267-94ff-1fa05d353232/levefusowuful.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3f65217-429a-4e13-8d05-2b978ca168ef/92782145584.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f036ca71-b526-4ac8-a8ce-ee80bb4f3ba3/nifumodubig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9772a844-1309-4d5e-a627-4e8800b0a026/jilugobumorodukiwule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40a03e57-25ad-4cbf-b44c-cde07f3f4c9a/65071203563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb18b5f6-4e7b-4ec6-a527-32e7fa249228/simple_math_problems_for_first_graders.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/075a489f-43a2-4a15-92f7-c68fe8e036c7/45087004099.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e09a4f1-cc58-4699-9581-891afc75c055/2__spotlight__5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/763daafb-c961-49bc-99bb-afe93cffaade/is_monat_regulated_by_the_fda.pdfIn 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_off00010263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10263 5328 bytes
SHA-256: 8950fa7b3300bd6cd0a76e76d7330d98af8a34812a28ebbff9101a99c8af4804
font_01_sfnt_off0001146e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146E 13240 bytes
SHA-256: 9919bc1e98649a2edbf24716c7284f75b2d2b4e4f1fdbab2bd93cc7103abc859