Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a427b5099682b4…

MALICIOUS

PDF

73.2 KB Created: 2021-01-12 14:05:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ea7fbb304f5ce70a766d3f16cbccddc9 SHA-1: 47d68da511b9c1eff19b2ab062f983853534715a SHA-256: 50a427b5099682b4487808691656a91370210298af4a4948e7138cd9717cba08
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or potentially malicious domains, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/aws?utm_term=marathi+balgeet+hd+video In PDF document text
    • https://static.s123-cdn-static.com/uploads/4382186/normal_5fde015aab412.pdfIn PDF document text
    • https://boziwukajolefix.weebly.com/uploads/1/3/2/7/132711983/larijusul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473053/normal_5faa71f2e2d2b.pdfIn PDF document text
    • https://gikesusemu.weebly.com/uploads/1/3/4/7/134775173/54d6f6b5fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419654/normal_5fa4edcf00557.pdfIn PDF document text
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/xotifagoje.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/6323409.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415742/normal_5ffcbd278b286.pdfIn PDF document text
    • https://pafetuvuwube.weebly.com/uploads/1/3/4/3/134321561/9645795.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/mamukawaxatali/i_would_like_to_meet_you_formal.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/tomoze.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/common_animal_quiz_diva_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/how_to_make_a_router_guide_jig.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/84277869572.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/28868790717.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/application_letter_for_fresh_graduate.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/monrovia_public_library_catalog.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_off0000e14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14A 5116 bytes
SHA-256: 673c09132c69ef989070de159cdef771bc1352bb2c717634835ac929dd21d443
font_01_sfnt_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 10784 bytes
SHA-256: a235c7009b6fcb1ba6bd8c482bf3840459d2e44ac9d9b1bb2c2989f09698846c

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