Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c56728ae9917a7…

MALICIOUS

PDF

74.7 KB Created: 2021-03-11 00:38:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 112aa76ee0e743c63657680798a3a028 SHA-1: bd1da3f337a865b0ae5db2cffadd8df57d333d07 SHA-256: c3c56728ae9917a7d1e8c7af715d105525abc52d7cfaa1190a21ba64797f3ae2
194 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/wix?keyword=how+to+write+a+manual+for+a+software PDF link annotation
    • https://fawitazekivaji.weebly.com/uploads/1/3/1/4/131454143/tutizituj_fiwuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381748/normal_5fd5f25e8d75b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420432/normal_601f34269ca1b.pdfIn PDF document text
    • https://xonadenot.weebly.com/uploads/1/3/4/6/134685596/38b4cd965c2c1.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/boss_therm_brtrf_user_manualb3pxr.pdfIn PDF document text
    • https://vajugape.weebly.com/uploads/1/3/4/7/134767319/f0ace44ba070d5.pdfIn PDF document text
    • https://sivabujik.weebly.com/uploads/1/3/4/0/134017760/2752781.pdfIn PDF document text
    • https://kabirajozef.weebly.com/uploads/1/3/2/7/132740353/b46738e2b7e3a0.pdfIn PDF document text
    • https://mamowolo.weebly.com/uploads/1/3/4/7/134714390/kawanizowulop.pdfIn PDF document text
    • https://xegezutiraviral.weebly.com/uploads/1/3/0/7/130775125/9980339.pdfIn PDF document text
    • https://voranafirodibug.weebly.com/uploads/1/3/2/6/132696030/4177c9d.pdfIn PDF document text
    • http://snapchat-alert.com/ledonovizagimitari2n4vg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446489/normal_6013c25c59a3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368982/normal_602d6358187ce.pdfIn PDF document text
    • https://borikalubir.weebly.com/uploads/1/3/2/6/132681749/zedidonorubipetonij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_ad4b76ae192746a8b56dac82c2157f9f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rorives/posavenutad.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/audyssey_multeq_xt32_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/83118271023.pdfIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_e918c705b5f84909ab76355a5aa4259a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vazisi/chain_png_hd.pdfIn PDF document text
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_6270d7ca498f4130b63e09a4afa74d52.pdf?index=trueIn 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_off0000e9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 4964 bytes
SHA-256: 6de2039fb9983f2d67535431e1f659f1ef68aa8462959c0fa3a7df5192065d79
font_01_sfnt_off0000faa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA5 10184 bytes
SHA-256: 5a33b228ebebbdad87ca56173043884a5d804a5e7cab1e05607dda9732f59979