Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3d92cd5623ab55…

MALICIOUS

PDF

69.2 KB Created: 2021-01-26 07:11:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8e2f07f8cddbd1521e18c93d482ff28e SHA-1: e68870bc48ba0fa46d9933975fb8378a8bbc6e0d SHA-256: ce3d92cd5623ab550ad8ad2f8e34eb967b9d16ec6a94eee573ef11e2fcef4c48
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with several heuristics flagging it as a malicious redirector and a link farm. The ClamAV detection and ML classifier further support its malicious nature. While the document body is heavily corrupted, the presence of embedded URLs and the overall structure suggest an attempt to direct users to malicious infrastructure, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=osrs+piscarilius+guide In PDF document text
    • https://dataremidesop.weebly.com/uploads/1/3/4/6/134697992/1176984.pdfIn PDF document text
    • http://sait-ok.ru/tunobunorabejen6nbyz.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/lWRpUhd/mini_stroke_and_stress_anxiety.pdfIn PDF document text
    • https://besugadofozoxi.weebly.com/uploads/1/3/5/3/135396803/48a71390558e.pdfIn PDF document text
    • http://yewes.space/real_cash_games_win_big_prizes_and_rechargesvhlqn.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/wemazun/zopajatenawejuzuf.pdfIn PDF document text
    • http://difedomuki.epizy.com/kvoa_weather_reporters.pdfIn PDF document text
    • http://lemujiv.epizy.com/suxeb.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/90472707525.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/86657658344.pdfIn PDF document text
    • http://doroxokile.epizy.com/war_chess_3d_for_pc_free.pdfIn PDF document text
    • http://dakokaxawizepu.epizy.com/assassin_s_creed_rogue_pc_32_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/66024436826.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_off0000d23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23B 5268 bytes
SHA-256: 5b406950680b856e56e87926b643b6b75eb105ac480c8ac1c411ff325cc249e3
font_01_sfnt_off0000e42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 10556 bytes
SHA-256: 38473276365ca645c5f508956fe59ebee0e26150ced095ac918f6e2c9dc51f23

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