Malicious PDF — malware analysis report

Static analysis result for SHA-256 9911ca370e41b531…

MALICIOUS

PDF

83.2 KB Created: 2021-03-16 23:58:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 9a26512eae766e1568c75a1e63e21d2c SHA-1: ef33b003f86ef397d773dc85d12e7ad32d8b15a1 SHA-256: 9911ca370e41b53191f167def3e135dcb4dc1d701f1118cc6b0d667d883453e1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links pointing to disposable domains. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan variant. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. The primary attack pattern involves directing users to a network of links, likely for SEO manipulation or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://lozipotod.ru/wix?keyword=the+pearl+by+john+steinbeck+theme+essay PDF link annotation
    • https://cdn.sqhk.co/tavedikovo/iKknyqd/german_truck_simulator_2_demo_chip_online.pdfIn PDF document text
    • https://zikemuwebiwolim.weebly.com/uploads/1/3/5/9/135992964/3133184.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370265/normal_600fae168be45.pdfIn PDF document text
    • http://help-feedback-amzn8.xyz/why_is_my_coffee_machine_leakingdbqwo.pdfIn PDF document text
    • http://hocostyle.ru/wilajijireti986lo.pdfIn PDF document text
    • http://copyrightreports.com/porogemanamuohwar.pdfIn PDF document text
    • https://cdn.sqhk.co/sidogorego/OrDROhh/fedasav.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/qPlhbsL/wawonalizovu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392199/normal_5fdaf7a939beb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423188/normal_6041ad43da066.pdfIn PDF document text
    • https://gidipefodato.weebly.com/uploads/1/3/5/3/135348522/pomemokol-kenutulorol.pdfIn PDF document text
    • http://avit0.pro/43659107007u53vq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427529/normal_601704d90eca6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479451/normal_5fe53a8fc032d.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/thdQY0q/car_crash_long_island.pdfIn PDF document text
    • https://cdn.sqhk.co/gupikekarobo/highcdd/bedwars_texture_pack_fps_boost.pdfIn PDF document text
    • https://cdn.sqhk.co/vufisolepu/fggijib/65823819440.pdfIn PDF document text
    • http://soldonlittleton.com/technivorm_moccamaster_79212_kbts_coffee_brewer_32_oz_polished_silverpdibj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://3926d074-74ab-41cc-aa9d-340192ccda4e.filesusr.com/ugd/5619e7_fd8350d8a65f4c9998fae35de7b65ba3.pdf?index=trueIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_f177191843b444f59f3c89d34404fce5.pdf?index=trueIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_cf05ceb3ac354da3b311a533813c7a58.pdf?index=trueIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_d8d4e1ff99b449e088027a0dffd7c369.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD9 5292 bytes
SHA-256: 2909ad9d6c21964c34274c865550b3bb6db906879bfa70979201604af038603d
font_01_sfnt_off00010ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA9 10632 bytes
SHA-256: 828b8a0f543c3673707f23f8f5fc7d1e36ee75892a90f951f2422427a4c4a54b
font_02_sfnt_off00013103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13103 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378