Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1b131f06084c10…

MALICIOUS

PDF

65.4 KB Created: 2021-04-30 11:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 236fe1c3903a5137e4b93bd0817de2e1 SHA-1: bae6b6faf64bb71a0af50803875b53b907c60b2e SHA-256: fc1b131f06084c10c06426a1658c2c63badd93e9d420b44909d8a8c783b9d57b
206 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, with numerous external links pointing to other PDFs hosted on disposable domains. The presence of 'utm_term' parameters suggests an attempt at tracking or manipulation. The ClamAV detection and ML classifier flagging indicate malicious intent, likely related to phishing or malware distribution via the linked content. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://resalured.ru/strik?utm_term=eureka+the+boss
    • https://nelizebowi.weebly.com/uploads/1/3/4/7/134734992/39d2b.pdf
    • http://fuvafutiku.22web.org/tajux.pdf
    • https://nometoxuf.weebly.com/uploads/1/3/4/2/134266561/tagixosofekede.pdf
    • https://revininone.weebly.com/uploads/1/3/1/3/131380081/2316050.pdf
    • https://pazuvokase.weebly.com/uploads/1/3/4/6/134615635/mamonatipu_gemadaxepiva_sidarubidovunez_sopejexexidig.pdf
    • https://xizuzumuk.weebly.com/uploads/1/3/2/6/132682261/0226897fd.pdf
    • http://betizekaxu.getenjoyment.net/55210005596.pdf
    • http://tiwujatujoput.mygamesonline.org/les_misrables_movie_soundtrack_-_red_and_black.pdf
    • https://gazelavulokar.weebly.com/uploads/1/3/4/2/134265358/559ae66b0ad5.pdf
    • https://xadijonoru.weebly.com/uploads/1/3/3/9/133997446/pakuzof_walofetiboli_dazujaxa_bakazoxominer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bbdfd32f-fa34-4104-a4d1-c661f9b34271/92482644599.pdf
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_8d1f7b31153948d0beba16b12851a247.pdf?index=true
    • http://fafovinipola.epizy.com/retukedajipufe.pdf
    • https://79c9c32e-6572-42fd-9c0e-61d057d48a34.filesusr.com/ugd/33a1c8_a21b8cb2a5fe49bdbdcd1f2fcba2c7a0.pdf?index=true
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_86069d6f8eeb40668851e5583544bf09.pdf?index=true
    • http://butopam.rf.gd/45192264622.pdf
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_486a06d259d448f6a121b490c04587c6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c425b89a-eec0-435b-92d3-ad48f84ae339/22827881717.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_off0000c40f.bin
fc49c6db7b0cce52cbe478b5a6630913ab2e9524ebf4551330abaab3f473b907		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC40F 4904 bytes
font_01_sfnt_off0000d4b2.bin
aab48216cf2fbfca898c3c37f832507b62cb755de6fc69580326da74c40842f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B2 10536 bytes

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