Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2c3aa08e64df45…

MALICIOUS

PDF

74.7 KB Created: 2021-02-10 22:05:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3072ffd70ad720cedda721f031172191 SHA-1: e49af4a007b608555cd3550bf807f8258288f033 SHA-256: ac2c3aa08e64df45345570d92df2fd361155823ca81451810f31abdcf9545e19
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable domains or known malicious redirectors, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to sites hosting further malware or phishing content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://crophysi.ru/123?utm_term=murder+mystery+2+godly+knife+values In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379601/normal_600f2e34bd210.pdfIn PDF document text
    • http://bigwin-1xbet.fun/739476074949c4ta.pdfIn PDF document text
    • http://supernefritroller.xyz/baby_boy_beautiful_photosikodk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446379/normal_6010f8dfbb0ab.pdfIn PDF document text
    • https://cdn.sqhk.co/xajimujigaju/hx6Lhd4/injustice_2_dlc_character_tier_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459325/normal_601c943782cdf.pdfIn PDF document text
    • http://future-techno.ru/varubete0ki1u.pdfIn PDF document text
    • https://cdn.sqhk.co/jipogidara/hzxheji/smart_tv_40_inch_4k.pdfIn PDF document text
    • http://copyright-security-ig.com/jotun_barrier_data_sheetvm5gk.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/QJjheDo/line_hop_series.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ketavulamuxi.epizy.com/ashoka_all_songs.pdfIn PDF document text
    • http://xuwunokebisul.rf.gd/warhammer_40k_tyranid_codex.pdfIn PDF document text
    • http://jimulopipuxofom.rf.gd/darius_guide_urf.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/psychology_practical_book_in_english.pdfIn PDF document text
    • http://sirilamezowi.epizy.com/bubble_game_for_pc.pdfIn PDF document text
    • http://jepelevewo.epizy.com/tijivatata.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/princesses_don_t_cry_song_free.pdfIn PDF document text
    • http://sizatopus.rf.gd/68946277634.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_off0000e677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE677 5592 bytes
SHA-256: dac5c5a3514d94babd213a035c9c17190cab5b6242b04aacecaa445d1e8d0800
font_01_sfnt_off0000f984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF984 10596 bytes
SHA-256: 7618cee0343d0aa4cc5bb8e0ea8c8e0742bfa93d186334fc00ad27694aa10141

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