Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2590faf6ab877a1…

MALICIOUS

PDF

78.3 KB Created: 2021-03-16 20:49:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f30903f250e1a00ae376e468806cc7ac SHA-1: 506df44bcb68073f81e9ec62242309843fc26c4e SHA-256: f2590faf6ab877a1b68a480d15fef67bf96e802fed8fd3a4759e89824100d0ca
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The heuristics indicate a high density of links pointing to disposable hosting, suggesting an attempt to distribute phishing content or redirect users to malicious sites. The document body, though heavily obfuscated, contains references that align with the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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 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://jottigo.ru/123?utm_term=heroes+and+generals+tanks+guide
    • http://helplnstagramcontact6088756.com/43623566903mphk9.pdf
    • https://cdn-cms.f-static.net/uploads/4469630/normal_601f1bd229e0b.pdf
    • https://cdn.sqhk.co/dutebevon/QicEiiN/7008512243.pdf
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/zatazamede.pdf
    • https://cdn.sqhk.co/temirikuji/lZjjijj/smash_heroes_hypixel_resource_pack.pdf
    • http://pofudaw.iblogger.org/segudofutopamukodineta.pdf
    • https://wagoburaf.weebly.com/uploads/1/3/4/5/134524365/5354730.pdf
    • https://fatitabo.weebly.com/uploads/1/3/4/7/134757356/2c4ab.pdf
    • http://mx50off.pro/5_paragraph_essay_sample1ussr.pdf
    • https://cdn-cms.f-static.net/uploads/4382405/normal_603a6a9ecee37.pdf
    • http://kadabafomelu.66ghz.com/blacksmithing_wow_guide.pdf
    • http://bonus332.site/the_template_strand_of_dna._what_type_of_molecule_is_producedmkflg.pdf
    • https://cdn.sqhk.co/bomunerafoju/gghbFhi/73465213336.pdf
    • https://cdn-cms.f-static.net/uploads/4404965/normal_6044683363524.pdf
    • https://puxibaso.weebly.com/uploads/1/3/0/9/130968956/bemulizonelata.pdf
    • https://nusoselif.weebly.com/uploads/1/3/4/4/134470887/jukese.pdf
    • https://cdn-cms.f-static.net/uploads/4393506/normal_6016e977417d2.pdf
    • https://kisuvali.weebly.com/uploads/1/3/1/1/131163683/588846.pdf
    • http://waxevamebe.22web.org/wibosikef.pdf
    • https://xobiduri.weebly.com/uploads/1/3/1/4/131437628/8398414.pdf
    • https://pikezusepi.weebly.com/uploads/1/3/2/7/132740337/sadopu.pdf
    • https://cdn-cms.f-static.net/uploads/4480728/normal_6017a5c253509.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dewifazegukom.epizy.com/mijotofafex.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f48f.bin
d9ff17afc7e0a29efed2fdfb2ecced283841fe6492e57e31f938993b6d179d11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 5016 bytes
font_01_sfnt_off000105ab.bin
f16869257a61a3d8f519e6cae78a765b3dfc576f104326243443bea0fbe406b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105AB 10868 bytes

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