Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67aa18373842728…

MALICIOUS

PDF

77.4 KB Created: 2021-06-09 17:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b86c1c18940b0466516c84c4139cf275 SHA-1: af67d27ffa3dc28a314c1e7a821f4abf87b9d5f5 SHA-256: c67aa18373842728889f48972226410af781b197f5e121b0ce4ac1c691758d5d
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 phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

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://oniceh.ru/pbw?utm_term=reading+comprehension+past+simple+and+continuous PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368972/normal_603b5f2e67e9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401983/normal_605a77d68f2da.pdfIn PDF document text
    • https://jefibapo.weebly.com/uploads/1/3/2/7/132712451/bf6b3454.pdfIn PDF document text
    • https://bododomeliba.weebly.com/uploads/1/3/1/4/131408614/zuvupunizuzubujij.pdfIn PDF document text
    • https://nenemonovov.weebly.com/uploads/1/3/4/6/134664350/bubisakomupe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481158/normal_6053541c43c50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407102/normal_606e7450ce3dd.pdfIn PDF document text
    • https://puzagoliwosur.weebly.com/uploads/1/3/4/4/134462366/xowutafesotoda-lemelobud.pdfIn PDF document text
    • https://vamabeloketofip.weebly.com/uploads/1/3/4/3/134344852/gusavipad.pdfIn PDF document text
    • https://xofilovinavi.weebly.com/uploads/1/3/1/3/131379248/xagosa-nefepuwipe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366676/normal_6055689ae3e22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464874/normal_6006b60b8cf3f.pdfIn PDF document text
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/6480337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494451/normal_6063478666fa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481684/normal_603ed5bbaf322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474977/normal_606645a551ee6.pdfIn PDF document text
    • https://raguloduw.weebly.com/uploads/1/3/4/0/134041620/cabd4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ea130ae0-dc32-439b-b873-32272e30fa91/lofogevowefosesove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aff6c746-9d43-49dc-8600-c1c9113e9545/37924925664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c63885d-a781-4bd4-8f74-c9d52614c28d/why_is_my_dsi_charge_light_blinking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a879f33-17d8-4fa5-a2e9-ed002b17c787/figoruwinejiteve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2a4259e-70f2-4fa2-afb4-100f53340eb4/twilight_breaking_dawn_part_1_movie_in_hindi_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e4584c4-2eba-4741-b2c5-bed73ca0b8a9/where_is_the_model_number_on_a_viking_refrigerator.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE100 5376 bytes
SHA-256: 10da20ac6267ba65656b586bbd73822f8659549cfdba88062cc6548cdf9de9fb
font_01_sfnt_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 11364 bytes
SHA-256: 2034a03f191f54639306a01e3788c80a085010d31975159df526a0d810caedd3
font_02_sfnt_off00011823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11823 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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