Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3017716cef9c41b…

MALICIOUS

PDF

72.6 KB Created: 2021-02-23 06:55:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 205fd2b9f4d28219fcf2654f505297b4 SHA-1: 3fd2a63f813770b9f84d416579a6275b3d356dec SHA-256: d3017716cef9c41bc9b95136f171a983cdc68ed629f65392be5bc40e63548baa
264 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains or known malicious redirectors. The document body, though heavily obfuscated, appears to be a lure related to a product manual, aiming to trick users into clicking malicious links. The presence of multiple critical heuristic firings, including PDF_MALICIOUS_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS, strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • 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://yafferge.ru/strik?utm_term=sq9+mini+dv+camera+manual+pdf In PDF document text
    • https://cdn.sqhk.co/vigesiji/hdinHig/8_ball_pool_old_version_download_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/wirubetena/hjhdPiq/30280144434.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/n2z8hh9/celebrity_cruise_stock_price_history.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwifoviwalo/cjibbt5/grass_cutter_sword.pdfIn PDF document text
    • https://mulofujuxemo.weebly.com/uploads/1/3/0/8/130874025/vawakopetuj.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/EdoLjgb/baked_catfish_recipes_without_cornmeal.pdfIn PDF document text
    • https://cdn.sqhk.co/wadalibituge/gcWNIhe/mifaxejuzurafiw.pdfIn PDF document text
    • https://cdn.sqhk.co/lubigegek/hdjd3zp/49998461135.pdfIn PDF document text
    • https://fegajasun.weebly.com/uploads/1/3/4/5/134502742/bafogujagabapat_tefisovozefemix_bobewije.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/Zbgdjgv/new_york_post_contact_phone_number.pdfIn PDF document text
    • https://gufekesunix.weebly.com/uploads/1/3/4/8/134888283/6920748.pdfIn PDF document text
    • https://tofudilasikota.weebly.com/uploads/1/3/0/9/130969343/1315608.pdfIn PDF document text
    • https://fejaxipanegis.weebly.com/uploads/1/3/2/7/132712099/nubevivizomuj_guzitekodata_nisomulorili_guzitafuji.pdfIn PDF document text
    • https://cdn.sqhk.co/zofagopipowi/bKKJfhf/xagenebatubuvogofusigi.pdfIn PDF document text
    • https://tijezelaxupoki.weebly.com/uploads/1/3/5/3/135340387/257bc5831bcc.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/CaggRia/head_start_human_resources_phone_number.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/jadere/how_to_change_oil_in_husqvarna_zero_turn_riding_lawn_mower.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/84382174198.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_off0000db7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7E 5568 bytes
SHA-256: 456c9b5bff4290751fc2dccb952a0eed3860b65af0fecf351bda32cd5b58f4e2
font_01_sfnt_off0000ee5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5E 11452 bytes
SHA-256: 8a7db4ac5bcc8c28ca186f9b85c2d65ee48591f78b5f516a6c9b5e6875c496bb