Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef882d5b5ed2a4b0…

MALICIOUS

PDF

97.5 KB Created: 2020-12-28 01:51:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ea4665d83d77f6ebf072179e260ad58e SHA-1: ef0f6c9768107e77f98646c097cbfe04b2559085 SHA-256: ef882d5b5ed2a4b0251b5b18e05ae86779cf090b8e79c20354bb654a1b668beb
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs point towards an attempt to redirect users to potentially harmful content.

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://trafftec.ru/123?utm_term=systems+engineering+textbook PDF link annotation
    • https://ruzizoradum.weebly.com/uploads/1/3/4/3/134317959/5086610.pdfIn PDF document text
    • https://lufaranari.weebly.com/uploads/1/3/4/6/134689474/7341825.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/djj8Gjb/38611747890.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470038/normal_5fc9965326df7.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/2hevkh2/karep.pdfIn PDF document text
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/1406128.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/5066370.pdfIn PDF document text
    • https://xezajorawelo.weebly.com/uploads/1/3/1/4/131408008/979938c9d7.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/45119.pdfIn PDF document text
    • https://tusemebi.weebly.com/uploads/1/3/4/3/134316443/94d2e11e7.pdfIn PDF document text
    • https://cdn.sqhk.co/kupemopo/UXt3iaj/tirokuzedariparova.pdfIn PDF document text
    • https://cdn.sqhk.co/jajotulix/iNavgiy/sound_tuner_online.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/belapawerezuju/phim_tinh_cam_thai_lan_hay_nhat_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/kamigovitakiril/dragon_quest_xi_wiki.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13612 3016 bytes
SHA-256: 6ba0570f3e12adbbc15d3706dec1b9526cbe6327d8a4be29f55098b9bef8231d
font_01_sfnt_off000140d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D8 5240 bytes
SHA-256: 21ebc19484a0655a93a47978ce3742fb064d8334d730a293fed462980d5c9178
font_02_sfnt_off000152a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152A9 11572 bytes
SHA-256: b5eb2237e145284a584d6791f17d668ac9a3bc57b15e996fcd3db18e9e70a7f7

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