Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e7aacc84aa32b49…

MALICIOUS

PDF

91.2 KB Created: 2021-03-22 15:16:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 73768b2537df0f28de5899512b1e00a8 SHA-1: a7c08dff917611fe5c320adc861a31c7511af5f1 SHA-256: 5e7aacc84aa32b495b187b56a34a4dd6f847be97b7d49b79d00fcc260f305a8a
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 pointing to disposable hosting services, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself is used to host numerous URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://kuzutuzo.ru/strik?utm_term=trane+tracer+sc+troubleshooting PDF link annotation
    • https://cdn.sqhk.co/jomonufo/he4kZgf/40835503932.pdfIn PDF document text
    • https://burufazifefep.weebly.com/uploads/1/3/4/5/134584298/f42b47cdf0c.pdfIn PDF document text
    • https://nufawufaza.weebly.com/uploads/1/3/0/7/130740177/9587060.pdfIn PDF document text
    • https://cdn.sqhk.co/lekibapufe/jY6rif2/medieval_warm_period_means.pdfIn PDF document text
    • https://redulexaxoxega.weebly.com/uploads/1/3/0/8/130874010/9044262.pdfIn PDF document text
    • http://gapijet.scienceontheweb.net/3631011607.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/fjfMcjh/craigslist_furniture_for_sale_springfield_il.pdfIn PDF document text
    • https://naxulukituno.weebly.com/uploads/1/3/4/8/134879135/d737b682d9cc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382614/normal_5fda659a2f13d.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/2Zhfgcs/photomath_ios_icon.pdfIn PDF document text
    • https://cdn.sqhk.co/tefaxobaf/h6yibuP/audio_player_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421062/normal_601eb40f966a6.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/mtUieHO/49977429127.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459941/normal_5fd183ceb5811.pdfIn PDF document text
    • https://pawuzoratifeze.weebly.com/uploads/1/3/4/4/134471058/db4620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_6027dea48107b.pdfIn PDF document text
    • http://mekomob.getenjoyment.net/24034644211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369781/normal_5fd7d638f3313.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/nSgiBgc/football_strike_football_soccer_kickstarter.pdfIn PDF document text
    • https://cdn.sqhk.co/gojikanemiju/jaQqeX2/nubaxaparitanitifixe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_6d7cae1c3b184b8dbf057bfb2dde7363.pdf?index=trueIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_5792d97d206b463a85fd4335daa0c90b.pdf?index=trueIn PDF document text
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_29bdb8e0096c4d61b22059df0f1ee026.pdf?index=trueIn PDF document text
    • http://bitenozof.atwebpages.com/parcc_practice_test_math_3rd_grade.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001160a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160A 5152 bytes
SHA-256: f990b90f0cb2776013d23b860476b5e82c89a5630095118065ff3375bb42d5b4
font_01_sfnt_off00012777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12777 6068 bytes
SHA-256: d2d10b6b0c668cf26faa9347c7054f8580c7eefa5cb7aecda2a4fba74bd025f0
font_02_sfnt_off00013728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13728 11216 bytes
SHA-256: f55f4a5715bb0796286328748a089d73d425895b7cbcf854418476eac93397c8