Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba00263bb709559…

MALICIOUS

PDF

104.7 KB Created: 2021-03-10 08:01:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1a94c5e638af2020b508397496bbe201 SHA-1: a1ccbf7125a593f90cdfd314f49f9ff30c6fc44d SHA-256: 3ba00263bb7095597dc7a0bc9f73f4655b8f747f4b273d926060dec1b5703447
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm designed to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier also indicate malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/award?keyword=anna+karenina+pdf+magyar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468270/normal_60118e2953ae5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485440/normal_604191234d49b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445564/normal_5fec9389a95d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381340/normal_5fdc4579d4e99.pdfIn PDF document text
    • https://lanekugufer.weebly.com/uploads/1/3/5/3/135351315/7065812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386335/normal_602150eaabb90.pdfIn PDF document text
    • https://mofibowego.weebly.com/uploads/1/3/1/4/131406437/sopasowapo.pdfIn PDF document text
    • http://vexetifiridik.mypressonline.com/chicco_keyfit_30_stroller_car_seat_combo.pdfIn PDF document text
    • https://zeraxoxuret.weebly.com/uploads/1/3/4/6/134642117/2378194.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/how_do_i_set_up_my_brother_printer_to_scan_to_my_mac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420934/normal_5fec0a5c70668.pdfIn PDF document text
    • http://pegejoruvufiron.sportsontheweb.net/how_do_i_file_a_legal_color_complaint.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383444/normal_60081c2fc3362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459055/normal_60239616362c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467573/normal_6032111dcbc66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490265/normal_60155480a15e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404290/normal_60241bae6d39e.pdfIn PDF document text
    • https://kalokawagubur.weebly.com/uploads/1/3/1/3/131398574/daban-gopejanix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463824/normal_601d9ef73b4df.pdfIn PDF document text
    • https://medogizelolu.weebly.com/uploads/1/3/1/0/131070938/6263626.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vubelifijam.atwebpages.com/holmes_humidifier_ultrasonic.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/sixoxilipapodorinevolusem.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_off00015d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D66 5304 bytes
SHA-256: 1f52204f70181e29b440b517597e58b45ec54724eb19d3f93cf3e18d9e17c1bc
font_01_sfnt_off00016f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F71 10676 bytes
SHA-256: 1cbe3c81dccb3765f7ba9ba0bd24605eb14f2fade979132866e2783b4bacb805