Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc03d736923411d…

MALICIOUS

PDF

73.7 KB Created: 2021-04-16 02:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bb6860a4041be1d1aef2ceeebe83ecc SHA-1: 1e5a8fbac5be070d9a5c2f4ba2e7669d9889f044 SHA-256: 4dc03d736923411d536d057c9cac64c08284fdb1a9bd5d1c9e05b1acae876b28
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one primary URL pointing to zajinet.ru. This suggests the document's purpose is to redirect users to potentially malicious or spam content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=vizio+e231-b1+no+remote
    • https://vigodabazo.weebly.com/uploads/1/3/4/8/134872933/9821053.pdf
    • https://fexafunoketu.weebly.com/uploads/1/3/4/8/134868662/640d60e9b1.pdf
    • https://filinisosiwox.weebly.com/uploads/1/3/0/8/130814007/fuzajopejolemavaxape.pdf
    • https://cdn.sqhk.co/fofotixoz/hb9pigW/73391182018.pdf
    • https://cdn.sqhk.co/nibubovixif/hh8hjJU/84104065687.pdf
    • https://cdn.sqhk.co/xuxawexa/c5hbhew/zesoxudojumamugatibof.pdf
    • https://cdn.sqhk.co/wikaraxixi/nNhf49P/descargar_tap_titans_2_hack_apk.pdf
    • https://nategenuniko.weebly.com/uploads/1/3/4/7/134749174/vudumoribupexo_kunazexa_wugomerila.pdf
    • https://cdn-cms.f-static.net/uploads/4413110/normal_602d67792ec72.pdf
    • https://vedalamiru.weebly.com/uploads/1/3/0/7/130776143/sozuzawidori.pdf
    • https://static.s123-cdn-static.com/uploads/4464878/normal_600840d1aaa6e.pdf
    • https://static.s123-cdn-static.com/uploads/4383136/normal_5fc6c708c9bee.pdf
    • https://diriremipujuna.weebly.com/uploads/1/3/4/2/134265666/lugosulurefurarago.pdf
    • https://cdn.sqhk.co/todiwapubu/jiPifie/the_animator_s_survival_kit_book_free.pdf
    • https://ziluxofizavamo.weebly.com/uploads/1/3/6/0/136009732/geziruzetani_weridevoxuko_janiduwezagabag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/01bfa1d6-ad1a-41b3-8a99-9ee8a7a4b4d7/jokufupalinuguzex.pdf
    • https://uploads.strikinglycdn.com/files/e24837b8-9a3a-4506-8bbd-6c41b7aef30c/13637841393.pdf
    • https://uploads.strikinglycdn.com/files/58aa2c28-b050-418f-b991-5d257006433f/innovators_dilemma_book.pdf
    • https://uploads.strikinglycdn.com/files/06670312-a745-4fee-811e-68c2ba03d96b/how_to_use_krups_coffee_grinder_gvx2.pdf
    • https://uploads.strikinglycdn.com/files/75fed864-ed23-4585-bead-7d6a466d4cb2/69976184586.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e54c.bin
04b7d823dd178cd67d72381eea4cfda11010b7a3f900cec56734d4bbea2e28cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE54C 4948 bytes
font_01_sfnt_off0000f628.bin
9a961d1c9474a2b8b0acaba3a14a3aaf9ee7fa5281512a25ca6389cd9bdca0f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 10428 bytes

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