Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc5b48944927131…

MALICIOUS

PDF

83.2 KB Created: 2021-03-30 11:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a4950d14eec9a6389e5774093c0924e5 SHA-1: c9dcec30c7bb59fccf0953277d5dfd15489c6d57 SHA-256: adc5b489449271315216fae966a13498be5b80824b1b7300f47e2461ac401edc
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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://soxebez.ru/award?keyword=vampire+academy+graphic+novel+pdf+free+download PDF link annotation
    • http://forecast.bet/57770049655c46sl.pdfIn PDF document text
    • https://mofagobebaz.weebly.com/uploads/1/3/4/6/134633285/roxawejisisu-weledimegeter-lizamagikasete.pdfIn PDF document text
    • https://muwewemumefiga.weebly.com/uploads/1/3/0/8/130874681/1263714.pdfIn PDF document text
    • https://norenepativen.weebly.com/uploads/1/3/4/3/134315866/vojapom.pdfIn PDF document text
    • http://iminn.ru/10251073627d7wx5.pdfIn PDF document text
    • https://noxawopaxuroge.weebly.com/uploads/1/3/1/3/131398379/4634944.pdfIn PDF document text
    • https://vixeregipidodig.weebly.com/uploads/1/3/4/5/134592438/7332237.pdfIn PDF document text
    • http://swast-group.website/limites_usuelles_des_fonctions_trigonomtriquese4pxk.pdfIn PDF document text
    • http://shoppermarket.online/how_to_reset_samsung_dishwasheryr6h0.pdfIn PDF document text
    • http://generatorsale.ru/zenegoa7uc.pdfIn PDF document text
    • https://linasiwafeki.weebly.com/uploads/1/3/1/3/131380288/6221616.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/pisedij/ponazebejiseg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b2ec4d0-69de-422f-848a-0b5b8048f5cf/scotts_speedy_green_2000_settings.pdfIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_775b52dfaf2d427ba4f790d372f86ad9.pdf?index=trueIn PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_36c21c0ac4d24488b993bab1a673fd52.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0851690-1fbe-498f-af7a-12a4ae2aa1eb/myne_owne_ground_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/how_to_do_citation_in_word_2007.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/fesapexanibeselin.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/pipodewafogudizaxema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8c2735e-45ba-4345-bb7b-521271733d37/shirley_jackson_the_haunting_of_hill_house_opening_paragraph.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/51324824157.pdfIn PDF document text
    • https://7f3dc8b3-869c-44c5-82eb-14ae88d57796.filesusr.com/ugd/dc4ca1_197a6cd54da746a799af97dda349461f.pdf?index=trueIn PDF document text
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_c9e1a3f299f14b54bc77cd2a7ea13d6f.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_off000102e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E4 5608 bytes
SHA-256: 5d6acc97d60e25437a664fa3d7607a39aa404266b1cc3056b5d4f38bb0440962
font_01_sfnt_off000115f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F2 11456 bytes
SHA-256: 2eaa6d94fd1c6f91d617c1bfa6d266d26aa0aec578cc83a5487a6766dbbc6e05