Malicious PDF — malware analysis report

Static analysis result for SHA-256 440ed4881598b3a6…

MALICIOUS

PDF

72.2 KB Created: 2021-06-09 09:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 70de798e1575538c23486a77c507aa83 SHA-1: 3c0b055c5b561531659374443a4397e166e721f6 SHA-256: 440ed4881598b3a66d2f705dab50aac4be6c24e494b700811ae53bd837e470b9
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, suggesting it is part of a link farm designed to redirect users to potentially malicious content. The presence of embedded URLs and the overall structure indicate an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=money+heist+season+1+toxicwap PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421768/normal_6022c0b0ed5d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498348/normal_6063f07fea900.pdfIn PDF document text
    • https://raxuzorufureraw.weebly.com/uploads/1/3/0/7/130775378/9232891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403282/normal_6043184ca4a1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389586/normal_60387b7cdc8cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4531523/normal_6010cb0e1e276.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451225/normal_5ffd65f7cc5d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474176/normal_5ffc1d101b30d.pdfIn PDF document text
    • https://dobetabuzaduguz.weebly.com/uploads/1/3/5/3/135312815/866fac51940.pdfIn PDF document text
    • https://xipejefokodidub.weebly.com/uploads/1/3/4/6/134612454/povujovodokapudu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390052/normal_5feeabeed8206.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408704/normal_605f3f597bf81.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a412996f-778f-4c8c-ab3c-f900ef40eebd/70157907812.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee5fb913-9b07-44fa-bdbf-3ce84c8ef28b/verb_worksheets_for_first_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3451e94-d037-4b75-81a1-a752f0a88849/gobajexigibuwaroluku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b1da84f-4509-41aa-9ba5-1e3eda2fb1a5/jack_reacher_never_go_back_movie_tamil_dubbed_download.pdfIn PDF document text
    • http://mizunebapod.pbworks.com/f/82876816303.pdfIn PDF document text
    • http://tojasakamu.pbworks.com/f/best_speed_for_netflix_4k.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a4e4b97-a9d0-41b5-802d-2cce771174d0/best_pokemon_booster_packs_to_buy_for_profit_2020.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD53 5212 bytes
SHA-256: 7bc1da742210a8f41ada68f4bba326bc792af6a38857a8d60b29876a4e6eb871
font_01_sfnt_off0000ef3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3E 10772 bytes
SHA-256: 7b6b3150c6f231c9e0a6463db733d9d0a2e425854477199c9ff9ef5d3de41a24