Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7fd860cf6233c7…

MALICIOUS

PDF

97.3 KB Created: 2021-03-11 21:42:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 60655df509abdd1c311905f11915c8ae SHA-1: 2e75b534501276d9d8922a0b4d5e4d46d14310d0 SHA-256: bc7fd860cf6233c7302bca9de0f9ea91f71e8568ff3ee8739ee759349148c0ab
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous external URIs pointing to other PDF files, many hosted on disposable domains. The presence of a callback lure heuristic suggests a potential phishing or scam attempt, although the document body itself is heavily corrupted and unreadable. The primary function appears to be directing users to external content, potentially for SEO manipulation or to host further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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://xajibur.ru/wix?keyword=wray+high+school+football+schedule PDF link annotation
    • https://cdn.sqhk.co/zolilobup/R9KhcbL/52970749503.pdfIn PDF document text
    • https://cdn.sqhk.co/lakekomum/bihhjhc/98859186480.pdfIn PDF document text
    • https://tivofexogi.weebly.com/uploads/1/3/1/3/131398075/veluwe.pdfIn PDF document text
    • https://cdn.sqhk.co/bupabumo/Tqgf5tH/download_videobuddy_on_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwaseja/jds8kre/hang_gliding_airplane.pdfIn PDF document text
    • https://cdn.sqhk.co/fepexeguma/jchfjeI/mini_block_craft_download_for_pc_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/jagapifa/dkkheii/xunubo.pdfIn PDF document text
    • https://cdn.sqhk.co/wupifufexix/jgjwijN/chicken_invaders_5_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/piravasufinu/1u27cjf/easy_raspberry_freezer_jam_without_pectin.pdfIn PDF document text
    • https://cdn.sqhk.co/fujigugi/jedgcgh/big_baby_meme_instagram.pdfIn PDF document text
    • https://davixugamewa.weebly.com/uploads/1/3/5/3/135334906/tokarigu_lirev_gowomufa.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/fasudikek/carton_plume_grand_format_noir.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/what_is_gods_plan_for_marriage.pdfIn PDF document text
    • http://roniderekatitim.rf.gd/30195956066.pdfIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_0dcae3ab6bcb4ce48dec18524f3a748b.pdf?index=trueIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_f29e9dbdfff54655a7aacfec7f770ae8.pdf?index=trueIn PDF document text
    • http://karelovaluz.epizy.com/boletepe.pdfIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_dbeb6189271c42a59aaab80398e4cd85.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/febopa/21106683717.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_off00013e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0C 5536 bytes
SHA-256: b88c5cc01162685c5379a6f25c8a35670196925771684f7e5971fbbc2fde13fe
font_01_sfnt_off000150f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F0 11520 bytes
SHA-256: 0664a2b933765d5431b9ebf28e30e33425a506e2dc15c7da1943d3bb22fb0b26