Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc34b8fc8b66b076…

MALICIOUS

PDF

95.9 KB Created: 2021-05-14 07:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cb37576288382f3aa52d68e529641606 SHA-1: b6e1eddfb43d2ec69d02febfa7283ad05c3ee1bc SHA-256: fc34b8fc8b66b0764760c8dbe3c85fa44101c225079999bb7233d0e4c619ec08
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan distribution attempt. It contains a large number of external links pointing to disposable domains, suggesting a link farm or SEO spam operation. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=dramatic+irony+in+romeo+and+juliet+act+5+scene+1 PDF link annotation
    • http://kazotapojiwi.mywebcommunity.org/10875091905.pdfIn PDF document text
    • http://jarevine.mywebcommunity.org/how_to_apply_ortho_glass_splint.pdfIn PDF document text
    • http://basumoxivor.sportsontheweb.net/agricultural_systems_of_the_world.pdfIn PDF document text
    • https://sifajovu.weebly.com/uploads/1/3/4/8/134874608/rozenazifiki.pdfIn PDF document text
    • https://fekanefitogi.weebly.com/uploads/1/3/4/3/134340372/01791b19ce.pdfIn PDF document text
    • https://kefubawivamati.weebly.com/uploads/1/3/5/3/135304753/jimubat-sugafupenuxim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488322/normal_603c4bce68edb.pdfIn PDF document text
    • https://talotemeve.weebly.com/uploads/1/3/1/6/131606578/e7c3df02336.pdfIn PDF document text
    • http://fojefojegut.medianewsonline.com/biomasse_energie.pdfIn PDF document text
    • http://rorogudadusosej.getenjoyment.net/28059495521.pdfIn PDF document text
    • https://xuxoxipabixu.weebly.com/uploads/1/3/4/5/134588436/zepawiresosizoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481270/normal_6017015f37bdf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415962/normal_5ff982342f204.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/muvarelo/rayagada_autonomous_college_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/corporate_social_responsibility_describes_the_firms_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74808c14-fd04-482c-870d-abd7e6cd39d8/2569013715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99db5f10-d272-4544-a3a4-97aaa250fe75/63056929589.pdfIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_53690406db7c42aab78b31a6d4f2b32b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/71276b57-8e61-4802-bdc8-23c4131d0c32/gurinesaxofe.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/90037193084.pdfIn PDF document text
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_26a4a1fe53bc4acb833a4a20975cf37f.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_off00013751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13751 5436 bytes
SHA-256: ed793d992fa2f55d5c215ba85c8292f09f90472f34bde9a287d9439f8242486e
font_01_sfnt_off000149d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D1 11420 bytes
SHA-256: ebcdf7852c56e5fa13f3f32dc837c0b1efbd0e085eb5df271ef665a7e4529786