Malicious PDF — malware analysis report

Static analysis result for SHA-256 43745c5ea042b9f4…

MALICIOUS

PDF

76.5 KB Created: 2021-03-08 13:17:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3ffe754c110b9f29ca33a6450fbbfca4 SHA-1: b61bf9a5e7ee1763bcf010c77c25c22e0c73c6c6 SHA-256: 43745c5ea042b9f42e218f68fceb1313ce0c5b0b6ad1905b52c5429a8ac5028e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs suggest a potential distribution vector for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/wix?keyword=bikini+bottom+genetics+worksheet+answer+key PDF link annotation
    • https://piramejujidizek.weebly.com/uploads/1/3/4/6/134694247/gibaloradalidajogi.pdfIn PDF document text
    • http://trells.space/56341911709tdpct.pdfIn PDF document text
    • http://gatorama.fun/bodijumotowagadozat9lrp.pdfIn PDF document text
    • https://sakuvajavabese.weebly.com/uploads/1/3/1/3/131383602/5830387.pdfIn PDF document text
    • https://levapexufusetij.weebly.com/uploads/1/3/4/9/134904519/nimodiz.pdfIn PDF document text
    • https://zugufirit.weebly.com/uploads/1/3/1/1/131163535/nafiwilekigav.pdfIn PDF document text
    • http://reduslim-ufficialesito.site/lageranoxugl8w35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481831/normal_5fcdcff7b61eb.pdfIn PDF document text
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/1d470eb7cc04b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421201/normal_603f96d96265f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415530/normal_5ffd986872b22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378379/normal_5ff7c38f5d4f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485828/normal_6032b81a97f9f.pdfIn PDF document text
    • https://nesavelo.weebly.com/uploads/1/3/2/3/132303009/nimovezunaxeg.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/tiduro/zoniwaberilalev.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/como_hacer_una_minuta_de_reunion_ejemplo_en_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bba539a-3045-48c6-9b19-b484276e20c8/why_does_my_washer_say_sud.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/57846612937.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/anand_movie_all_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2508e431-9ca4-47a0-bd5b-82ef18986140/80949480775.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_off0000ebab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 5628 bytes
SHA-256: f37139736c679fe16c5046e22b5efef9c4914d274977ad8a04b1b39138b34ca6
font_01_sfnt_off0000fed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED0 11196 bytes
SHA-256: 0114aac06bfdb4901d7f9fc9a513020ce974196524d8da6f20cce28db7cf5d86

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