Malicious PDF — malware analysis report

Static analysis result for SHA-256 79832c8079b19f27…

MALICIOUS

PDF

74.4 KB Created: 2021-05-28 09:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9128ea4690cc6ff45dd529af96c4c472 SHA-1: b47368aa63d6bfd3b843fd073239aa015fcf3c9e SHA-256: 79832c8079b19f27304ed92fa8a7628a6709ea77926a094d7d38db83a058ba0c
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://yafferge.ru/strik?utm_term=online+challan+form+bise+rwp In PDF document text
    • https://sowalofawu.weebly.com/uploads/1/3/4/4/134441006/suwedovunofozefuwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_601bbec602a53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408188/normal_60014408e08bd.pdfIn PDF document text
    • https://sadibagisu.weebly.com/uploads/1/3/4/7/134758630/maweviwubemivuj_fomatixud_wefabur.pdfIn PDF document text
    • https://zitavumerut.weebly.com/uploads/1/3/4/4/134465292/verobutakusemip-lebanafoz-nosimuzojinal-vipivaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468812/normal_5fe7883e8abbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465257/normal_6058056758936.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450240/normal_600049e11ac1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375073/normal_603c46974d8e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471995/normal_5fff6a9eb2efa.pdfIn PDF document text
    • https://wejatinolu.weebly.com/uploads/1/3/1/4/131438249/823595.pdfIn PDF document text
    • https://komolelavox.weebly.com/uploads/1/3/4/5/134518501/suromunojobiw.pdfIn PDF document text
    • https://rimidewazasi.weebly.com/uploads/1/3/4/3/134317879/vekaxasefojunuto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370089/normal_5fd7c033325bd.pdfIn PDF document text
    • https://xomivumikeso.weebly.com/uploads/1/3/0/7/130774979/2218539.pdfIn PDF document text
    • https://xilapadoz.weebly.com/uploads/1/3/4/5/134588650/7325018.pdfIn PDF document text
    • https://nadepopuzoli.weebly.com/uploads/1/3/4/6/134611029/sikubina.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/b93f6199-fdc0-488b-8fc2-88528d13e5b6/kovexedewowezagoda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/036fcaa0-81e6-46bb-8921-68450c278d32/math_olympiad_contest_problems_volume_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f78d0bc-9f2b-4596-bfaf-9fb710f51b35/8405156210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93b1cd7b-fa2a-40af-9714-f3ab61398c35/the_great_gatsby_comprehension_questions_chapter_1-3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19390d27-2bf9-4d4f-9b09-2482c9ab7479/naziwajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be456523-43e0-49ab-ac34-075d023400b0/the_hunger_games_books_hardback.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60016d51-1a56-40d1-9689-e6dcd634c640/67205232271.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea25e7d3-bc05-4c43-b28c-c9ce1783ea32/20951709127.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_off0000e626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE626 5512 bytes
SHA-256: 8a507c5c803cafda0103816416c2782f8331a4235c36e2073735ff6f1322a671
font_01_sfnt_off0000f8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C7 10296 bytes
SHA-256: 237857c25e7c62ff45bb370dd2b8defd89e964aecc682edbc90ec63c49227822