Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa3efc6dcf14e48…

MALICIOUS

PDF

75.3 KB Created: 2021-05-02 06:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d72f47569e336de9430c6a4c1053459c SHA-1: 7bc44a66331cd3fe737d2106c49f4706f2ad5054 SHA-256: aaa3efc6dcf14e48e92bd281905ce08ec306827d85f7ffc0961559ea3c03646f
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://golowaki.ru/strik?utm_term=what+is+skyworth+wifi PDF link annotation
    • https://cdn.sqhk.co/kivipemo/Coljfza/20686375296.pdfIn PDF document text
    • http://ndfnasg.xyz/wejulipumevakclpo.pdfIn PDF document text
    • https://bifixebuwo.weebly.com/uploads/1/3/0/7/130776276/sufiwade.pdfIn PDF document text
    • https://nazugawexavidi.weebly.com/uploads/1/3/4/6/134678572/a6eecf.pdfIn PDF document text
    • https://sibevuguz.weebly.com/uploads/1/3/4/8/134859718/44c14087.pdfIn PDF document text
    • https://cdn.sqhk.co/kimazibo/w1jghdv/local_backup_whatsapp_android.pdfIn PDF document text
    • http://lessonsonline.site/29399168250m62a5.pdfIn PDF document text
    • https://bupafenanibud.weebly.com/uploads/1/3/4/0/134042845/xazawisopoxelam.pdfIn PDF document text
    • https://judurufag.weebly.com/uploads/1/3/4/6/134688768/puvabijom.pdfIn PDF document text
    • https://cdn.sqhk.co/xurajalijok/idijbgf/does_he_love_me_yes_or_no.pdfIn PDF document text
    • http://profoto22.ru/zatowunezibalemug1npec.pdfIn PDF document text
    • http://babysampler.com/linear_and_non_linear_scatter_plotsg8dc8.pdfIn PDF document text
    • http://rastet-malysh.ru/interstitial_lung_disease_guidelines_20167pvy7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tibitexil/9213843093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b2f1449-48ad-4f76-ba5a-f731eb91be25/73595687428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/897bf0a7-4b63-4e9f-98b9-1a32acd31487/56781597990.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/337dc6f4-8a05-498c-b47e-7bc648ab2b75/books_like_11_22_63.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd59113c-1cc2-41e4-b881-0aa87ef7d991/how_often_do_you_get_paid_at_dollar_tree.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbee531b-5b76-4ed3-b976-7e01c8601f7b/rarotoguwojusitumemimesum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b81e5755-a3b1-40ca-9f69-79747fd76542/dulopunebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2159c86-2404-47f1-89c5-a3b0358d814b/tumosesexuzopa.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/chicago_manual_of_style_reference_citation.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_off0000ea38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA38 5096 bytes
SHA-256: 8fd9cf57439d611dbbfe29eeb907ea64fd2e808c36ccde43820561a8a5a57e1f
font_01_sfnt_off0000fba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA3 10600 bytes
SHA-256: 34f6ffdbe1e2bd775487d19cf9c6fb17f50a6ff7034365e2ea6619c57e55c4cd