Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d72a380b3ce63c…

MALICIOUS

PDF

76.7 KB Created: 2021-04-02 20:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9b5feb78f0c185bff0f240eb264e1d4b SHA-1: b0333ae01b148e1248a2b8959df26d378587b013 SHA-256: 18d72a380b3ce63ca18c4bd040d397e0a5c155009a89873e035b5a394a91efc8
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, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://soxebez.ru/award?keyword=basic+mechanical+engineering+drawing+book+pdf PDF link annotation
    • https://kemovovem.weebly.com/uploads/1/3/1/4/131408999/xijogu.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/bmuqROL/smart_car_price.pdfIn PDF document text
    • https://cdn.sqhk.co/tupizurelir/u0rgcjf/hachiko_book_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462678/normal_60495a1cb7570.pdfIn PDF document text
    • https://cdn.sqhk.co/wemitupu/hdSwCmE/tanks_a_lot_tank_driving.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzosexiwugu/Oapqjht/infective_endocarditis_prophylaxis_antibiotics.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480905/normal_5fdf5d707c54c.pdfIn PDF document text
    • https://nobaletakalesig.weebly.com/uploads/1/3/2/3/132302751/xabofibenomu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465545/normal_604d9d7be40f5.pdfIn PDF document text
    • https://cdn.sqhk.co/losokifape/6t9pgcw/exodus_meaning_in_english.pdfIn PDF document text
    • https://ririzunok.weebly.com/uploads/1/3/4/7/134712782/pobalawafi.pdfIn PDF document text
    • https://cdn.sqhk.co/sazobenapur/idVhiMk/21985391048.pdfIn PDF document text
    • https://cdn.sqhk.co/famagafe/jaBibhe/minecraft_pe_superhero_mod_ios.pdfIn PDF document text
    • https://xapitutas.weebly.com/uploads/1/3/0/8/130813648/1d2d1db8.pdfIn PDF document text
    • http://mizolaresunade.iblogger.org/ruwomifedoxexexalupavoda.pdfIn PDF document text
    • https://cdn.sqhk.co/dibatafuba/Kd1haig/icd_guidelines_for_ischemic_cardiomyopathy.pdfIn PDF document text
    • http://lopabobogegise.iblogger.org/44857461806.pdfIn PDF document text
    • https://fapurexetekuwud.weebly.com/uploads/1/3/4/5/134508670/pojotipiga_tilusiruxojabig_tamurizu_mixigudo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380536/normal_5fc71b48361cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fusifovizit.rf.gd/jizonerudusifetageweso.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/jarelipewilixinifivawime.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/kerili.pdfIn PDF document text
    • http://wojobawezelo.rf.gd/payzapp_apk_new_version.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/discrete_uniform_distribution_mean_and_variance.pdfIn PDF document text
    • http://xigatif.epizy.com/how_to_insert_beta_in_word_on_mac.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_off0000edd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 5916 bytes
SHA-256: 32f280be283e1dcec49cdaba33c08431360fd973e9b013e0d2501f70b8a812dc
font_01_sfnt_off000101da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DA 10312 bytes
SHA-256: f2f5b259ea46dff72767e93fa331ab4033d50ab34fdcf2971ae146c1d0465ad5