Malicious PDF — malware analysis report

Static analysis result for SHA-256 875ddd8239f31370…

MALICIOUS

PDF

75.0 KB Created: 2021-04-12 19:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 673943c4ff9875427d07ceb4bbf728ba SHA-1: bcb372cdbb7d342ecc47b664de49cedca8568f53 SHA-256: 875ddd8239f313708665f566d894d353e102ff27ebbd03e936eb16a5cf0280e3
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with a high ML score and ClamAV detection indicating malicious intent. The document contains numerous external links, many hosted on disposable domains or subdomains, suggesting an attempt to direct users to potentially malicious or phishing content. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://jumiwimov.ru/strik?utm_term=what+are+character+defects+in+aa PDF link annotation
    • https://cdn.sqhk.co/regomesu/fn1him0/gunship_battle_helicopter_3d_game_download_hack.pdfIn PDF document text
    • https://tiwibuvemugijaj.weebly.com/uploads/1/3/0/7/130776889/cca082b48.pdfIn PDF document text
    • http://megalit-korolev.ru/red_and_white_christmas_tree_decorations6vt5w.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/33W3Pjc/juzokizim.pdfIn PDF document text
    • http://xufuxenu.mypressonline.com/naper.pdfIn PDF document text
    • https://nugukijozagesek.weebly.com/uploads/1/3/0/7/130739433/guliwubigixulim-nufuginutali.pdfIn PDF document text
    • https://cdn.sqhk.co/bemowikaza/kgdUibJ/hdfc_mutual_fund_kyc_form_for_nri.pdfIn PDF document text
    • https://bafovulik.weebly.com/uploads/1/3/1/0/131070506/9bc61b15c4a4ff2.pdfIn PDF document text
    • http://oneitstore.info/flowchart_symbols_cheat_sheet3vuk2.pdfIn PDF document text
    • https://cdn.sqhk.co/pemazekefise/hggjhc8/word_games_that_pay_you_money.pdfIn PDF document text
    • http://henrysavbr.site/instagram_mod_apk_more_followerscrqm7.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/ijgmkAX/ixl_learning_center_northville_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/xafukapewe/7Kjcfgj/support_local_businesses_app.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/c1hgidd/yellowstone_cast_season_3_jamie_s_dad.pdfIn PDF document text
    • https://senevilamopon.weebly.com/uploads/1/3/0/8/130814687/cdf4f.pdfIn PDF document text
    • http://luxibenuguk.getenjoyment.net/how_to_att_landline_call_forwarding.pdfIn PDF document text
    • https://cdn.sqhk.co/wogirujut/ehh52XL/45637333935.pdfIn PDF document text
    • https://cdn.sqhk.co/puwukuwos/jhgkjir/sikufasigulipugagopo.pdfIn PDF document text
    • https://cdn.sqhk.co/bupitagalir/4gghdrU/vuvukusisi.pdfIn PDF document text
    • https://tepadomuxufebe.weebly.com/uploads/1/3/1/3/131382092/4419ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_d4a719aa95564dfb861e0a79eac39cc0.pdf?index=trueIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_c83e2a3625974d20bebf2c38327bb996.pdf?index=trueIn 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_off0000e79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79E 5088 bytes
SHA-256: 713edb42f326fea5d1489bf55461a255d740399e49c2af1901d828082e091392
font_01_sfnt_off0000f8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F8 10656 bytes
SHA-256: 95c75a78804a26120c911858872e8286f1956509c9add2a79071ec4c13eb0134