Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffe273d002ab8dd7…

MALICIOUS

PDF

76.8 KB Created: 2021-06-11 20:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5bdc9cddf5371746e15a41c04ecaaca4 SHA-1: aa39a06fabec46e2d74f12329a5a635392565fa4 SHA-256: ffe273d002ab8dd70090f827ba62df5d5a717c8e55585d45edd658e2c546bc38
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs and the heuristic firings strongly indicate that the primary purpose is to redirect users to potentially malicious or spam-related websites, likely for advertising revenue or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crysiq.ru/pbw?utm_term=vernier+caliper+questions+and+answers+pdf PDF link annotation
    • https://toxuweraf.weebly.com/uploads/1/3/4/1/134108638/0737d63057a.pdfIn PDF document text
    • https://fowedejuman.weebly.com/uploads/1/3/4/5/134518602/6988239.pdfIn PDF document text
    • https://woduberorakemam.weebly.com/uploads/1/3/4/6/134667752/wijatizu.pdfIn PDF document text
    • https://besuxape.weebly.com/uploads/1/3/4/3/134374749/1547364.pdfIn PDF document text
    • https://ponokexagetax.weebly.com/uploads/1/3/4/3/134326843/xuvadagokufaja_dunatevemujoti.pdfIn PDF document text
    • https://kisezuxuromo.weebly.com/uploads/1/3/0/7/130776201/vabetab_lafuzazonu.pdfIn PDF document text
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/0edaa279889.pdfIn PDF document text
    • https://sisebafob.weebly.com/uploads/1/3/0/7/130776599/sitomo-betivadimufe-melasez-nevetinegiv.pdfIn PDF document text
    • https://roxexiku.weebly.com/uploads/1/3/4/4/134445291/todomejef-vunufe.pdfIn PDF document text
    • https://pafufido.weebly.com/uploads/1/3/1/4/131407890/pupeseniruwugoxid.pdfIn PDF document text
    • https://mifafipuwekirej.weebly.com/uploads/1/3/5/3/135327035/6974552.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vojewukejiwu.pbworks.com/f/6867466164.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b92fad2-8a7d-4684-9051-0cb02b7c9d55/31168825224.pdfIn PDF document text
    • http://bomasasawavi.pbworks.com/f/how_do_you_find_upper_and_lower_bounds.pdfIn PDF document text
    • http://gevetijusova.pbworks.com/f/45033825739.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3103b744-9172-46cf-99bd-1d4d7a07f95d/77947006552.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/w/file/fetch/144611280/cell_organelles_mcqs_with_answers.pdfIn PDF document text
    • http://marutipug.pbworks.com/f/wupofibukasanovigikama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3b0700c-ec16-44ea-af65-db32f82703f3/how_to_update_kindle_4.pdfIn PDF document text
    • http://selapiwilapa.pbworks.com/f/ramadasu_songs_mp3.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/w/file/fetch/144412059/2019_hellcat_red_eye_charger.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD968 5332 bytes
SHA-256: 0550698dec2c319ebb618f5c2e9631e0065cc822c075bf26bf548e2b34b808fb
font_01_sfnt_off0000ebac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAC 10684 bytes
SHA-256: 43a312fe68bf29c97f068d4908e5eb26258cf151d526112ce441fef633d0adfc
font_02_sfnt_off00011011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11011 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501