Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec10ab6ebc39a0d…

MALICIOUS

PDF

76.1 KB Created: 2021-06-08 19:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1ecb0b22bb8b69d19670c0aee992c0ba SHA-1: 44cc47778031822d84408b01b87edd93c572c99a SHA-256: 8ec10ab6ebc39a0db34d501994af0bf3428b0d22975dfa776a9960e464eb8bc4
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable hosting services, suggesting a link farm designed to redirect users to potentially malicious content. The primary URL, 'https://synerhu.ru/pbw?utm_term=migrant+daughter+sparknotes', is presented as a search result, attempting to lure users into clicking through. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/pbw?utm_term=migrant+daughter+sparknotes PDF link annotation
    • https://sopaxibifezubin.weebly.com/uploads/1/3/4/6/134608036/tenojoni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497658/normal_603ffa099bf72.pdfIn PDF document text
    • https://mokugutareno.weebly.com/uploads/1/3/1/6/131606089/c28e4.pdfIn PDF document text
    • https://kajemawukik.weebly.com/uploads/1/3/4/5/134589491/1226104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500883/normal_6046fd6578649.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394062/normal_5fd9d2642f488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459914/normal_6065491c2a453.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484636/normal_5fe251dc30548.pdfIn PDF document text
    • https://wedezetepeb.weebly.com/uploads/1/3/4/5/134528952/pobidapusezuk-muzakiruxesog-siwixoputi-sokenegiri.pdfIn PDF document text
    • https://nodikebe.weebly.com/uploads/1/3/4/0/134095868/xafudajodujop-totokupare.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482617/normal_5fc93ede3e7a6.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4387230/normal_60b19d09077ed.pdfIn PDF document text
    • https://panulozeti.weebly.com/uploads/1/3/5/3/135351273/xujubudobapa.pdfIn PDF document text
    • https://fapasinexiri.weebly.com/uploads/1/3/4/3/134346339/pafuniburuku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468289/normal_6027f1994235f.pdfIn PDF document text
    • https://jawavovamote.weebly.com/uploads/1/3/4/7/134748122/xepiromegabuda.pdfIn PDF document text
    • https://nixixowazexifaf.weebly.com/uploads/1/3/7/5/137516650/281b7ada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368955/normal_6055bdfc7479f.pdfIn PDF document text
    • https://wuwonerosetopux.weebly.com/uploads/1/3/1/6/131606808/modunibigepubix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383699/normal_603790a636ff7.pdfIn PDF document text
    • https://jutaxusuwixesel.weebly.com/uploads/1/3/4/6/134678787/2889305.pdfIn PDF document text
    • https://dusuwepi.weebly.com/uploads/1/3/4/5/134589125/9fe919fe8bc780.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/fb3044f1-bd27-4d18-831e-ab15672eb562/43578884086.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d022ce71-57ed-427d-bcf3-41744840bb3b/which_salt_is_more_soluble_in_acid_than_water.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1084b316-29c5-41a0-b57b-2fa1dacdc87d/fundamentals_of_microelectronics_razavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23fb8b9e-99b2-4399-b05a-cdc66e11f044/how_daphnia_reproduce.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b07da2c-c47f-4053-acba-707d0eb339cd/where_is_5th_3rd_bank.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_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 5260 bytes
SHA-256: fc3f38de1237e1b4e16a0e80c82c086e2b8f68d3abf5e77ea7f98ac4f810f88d
font_01_sfnt_off0000fe8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8D 10172 bytes
SHA-256: 4d30137c0310cfead39db52476a9eeaa7973248f83a57d253fab518bd3d3545d