Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10ef83c8b864919…

MALICIOUS

PDF

77.7 KB Created: 2021-03-05 22:05:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c93dc2c517eb4e70b85b36c62b0f4298 SHA-1: f052853661e5b25f9c81e1dbf1c4cc9b7a40de50 SHA-256: d10ef83c8b864919a23d58bd89afcbbdcf8e46ee803ab2ce845492948bbcf8b5
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The 'SE_CLICKFIX' heuristic indicates the document may instruct users to execute commands, a common tactic in social engineering attacks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://seumenha.ru/strik?utm_term=plantronics+wireless+headset+usb+not+recognized PDF link annotation
    • https://cdn.sqhk.co/gevopobi/ijfRjf8/30328160416.pdfIn PDF document text
    • https://cdn.sqhk.co/gabebutiz/8gMkDhe/fobifabokajevinoze.pdfIn PDF document text
    • http://kaguveka.22web.org/56589879309.pdfIn PDF document text
    • http://lawewonuraxap.iblogger.org/how_to_write_an_essay_on_covid-19.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_9905bef4c1644d85b192ad320c7521cc.pdf?index=trueIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_e54c131efd2547ebb3333bde744b4a18.pdf?index=trueIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_99be6b8da5744ea285a8c4b42d7748b8.pdf?index=trueIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_b68455e2025d4a29a984a3e8e96f48d4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b67fb11-850b-4ea8-b736-093e07d1900e/viva_el_toro_chapter_6.pdfIn PDF document text
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_68dee8a9c0bb475790e33158be032595.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d18372ed-92bb-4746-a848-6f17d1ee30f5/2005_chevy_malibu_lt_v6_specs.pdfIn PDF document text
    • http://mopafanimuwez.epizy.com/70397455381.pdfIn PDF document text
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_4cd2ff9ff03b4039b0fb1c53710ec3e6.pdf?index=trueIn PDF document text
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_32040bf31afc48a9922b4f08daf43504.pdf?index=trueIn PDF document text
    • https://4c6480a9-ccec-4c20-853c-cc48681c44ad.filesusr.com/ugd/935adc_d6fee2e0d67f45c488e771af2ded2a41.pdf?index=trueIn PDF document text
    • http://zufakugofozufi.epizy.com/zaruwarasotaxa.pdfIn PDF document text
    • http://nofifejagarenut.epizy.com/67062110525.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_off0000f1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DE 5484 bytes
SHA-256: 0af45e04c89cadcde9103cfc924d1c453edd788aa6d69d5643f8d5b60e102048
font_01_sfnt_off00010493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10493 10964 bytes
SHA-256: 70d43ffb44c46becbac8b295ee31c84741ee45253a5fd0c2040207ea182ffb4e