Malicious PDF — malware analysis report

Static analysis result for SHA-256 79bd1056fe4cf9b1…

MALICIOUS

PDF

73.2 KB Created: 2021-03-07 03:44:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 07da576551b7a30b0799fec07c0b4928 SHA-1: b507b620e928b104e163563f708acb3db7dbdd33 SHA-256: 79bd1056fe4cf9b16b6b89840bf7e4d88ee7c7cc816fa07064c4ddf55f9141df
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious sites, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/wix?keyword=map+of+southwest+asia+political PDF link annotation
    • https://cdn.sqhk.co/nolagutotato/U63l7ij/game_of_thrones_cast_king_stark.pdfIn PDF document text
    • http://fineagencyy.com/napenakumvwvt.pdfIn PDF document text
    • https://cdn.sqhk.co/nepofigiper/gdPchjB/idle_poring_guide_archer.pdfIn PDF document text
    • http://erkutungotu.com/al_final_mueren_los_dosqfiwl.pdfIn PDF document text
    • https://cdn.sqhk.co/wugeguxu/gcMhagg/44382894489.pdfIn PDF document text
    • http://xuponigivixi.66ghz.com/55446884476.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/ehfjcjj/rukusi.pdfIn PDF document text
    • https://cdn.sqhk.co/liramesot/djhhdUa/bravelands_book_6.pdfIn PDF document text
    • http://purpless.vip/46437791279z0w3b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4bda5b3-6ff2-4b3b-a19d-d2b09a0f4cdb/the_hidden_oracle_book_2.pdfIn PDF document text
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_1636c2890a6147b89c48f0b48bc70ad1.pdf?index=trueIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_27ff75308b5c454f89b748112abd34b6.pdf?index=trueIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_a2f56911eef94e3aa369872ebbb2692b.pdf?index=trueIn PDF document text
    • http://bizebiza.rf.gd/refrigeration_and_air_conditioning_iti_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c30d6878-709d-4522-8523-78526505fd7c/how_to_solve_rational_exponents_and_radicals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b3acae9-6dcb-4c09-b8d4-3d0213811fcb/heath_zenith_motion_sensor_light_stays_on.pdfIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_70bd806d99f84f7eaa78dfda81539aa6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a72031d1-828d-4c7b-a122-ae8b4336b1fc/mxq_s805_android_firmware.pdfIn PDF document text
    • http://todoxejanifala.rf.gd/guest_services_coordinator_job_description.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e71510f-fbb2-4330-a05b-f4d79694c877/snakes_in_suits_revised_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30bec425-5a74-4c9e-bf98-ddc5215bbc8f/88353044805.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_off0000e2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C6 5104 bytes
SHA-256: 3bd55e18c1b29739116c936801b7c784bde1b04489c64e6f5a452058c3c9e16a
font_01_sfnt_off0000f44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44D 10408 bytes
SHA-256: 1395e79af68f4e12afb6234161a3d5a5f47c43a2a4c3f3411b9eefdc7636e8ae