Malicious PDF — malware analysis report

Static analysis result for SHA-256 4419bc71af64fd15…

MALICIOUS

PDF

120.6 KB Created: 2021-02-13 13:55:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 46fc18152a63e6b5c9586cbb6ce249da SHA-1: fff5e71f52ac7e40f1b7f359293fd8daa2dcdcf6 SHA-256: 4419bc71af64fd15c9390f102e0d8e44f20a5a02b4bece43c77610a45f8fda31
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' and another flagging an external URI. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of urgency language further supports a phishing or social engineering attack. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jottigo.ru/wb?keyword=fda%20bacteriological%20analytical%20manual%20online PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454561/normal_60088110b4521.pdfIn PDF document text
    • http://slamelina.website/lasanurebixigiwofobupigax3874h.pdfIn PDF document text
    • https://cdn.sqhk.co/kagixepo/7gdic3f/du_application_form_fees.pdfIn PDF document text
    • https://kekufakaxuw.weebly.com/uploads/1/3/2/7/132740700/sunevinejavozo.pdfIn PDF document text
    • http://instasurprise.online/dujoxulavazimamosolewozes1cas.pdfIn PDF document text
    • http://peskomment.ru/ripodujoledulappooys.pdfIn PDF document text
    • https://cdn.sqhk.co/dabigewom/gcgipYW/aaron_rodgers_girlfriend.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456671/normal_5fc9fbdee19ee.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/banula/arabische_tastatur_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/62876437319.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/assam_news_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/pojexamixukebutisumu.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/azure_dns_zone_arm_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/free_antivirus_avast_terbaru.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/wixatapozufu.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/meri_behna_song_free.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18383 5276 bytes
SHA-256: 5e04d3c2a2ff8f00582f034eaf3c68674e2e06b49f283de13767f79b97b9411d
font_01_sfnt_off0001956b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1956B 12096 bytes
SHA-256: 88741211235c91d8b24dcb5edd6d73f730d465730b6266e7c74f853a2c4f2607
font_02_sfnt_off0001bec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEC7 16136 bytes
SHA-256: 4a82d930af4ff3021f3d19cbd37464c8e664c90bef13661c9db69df894853898

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