Malicious PDF — malware analysis report

Static analysis result for SHA-256 83dc3e0c75343ec2…

MALICIOUS

PDF

81.4 KB Created: 2021-03-16 17:47:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 223ec57971129043a0ef605d0dd04ad7 SHA-1: ed6f0a49ca2c530e9dd4c423114bedeeadf78d0e SHA-256: 83dc3e0c75343ec2f4b19e9b2a5a665d6b707634c0c86f71c3d78db293e9fc02
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The embedded URLs are likely used to redirect users to malicious sites, potentially for phishing or malware distribution.

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://druttle.ru/strik?utm_term=happy+endings+by+margaret+atwood+summary PDF link annotation
    • http://zimezobot.getenjoyment.net/51793378966.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/psalm_23_verse_6_afrikaans.pdfIn PDF document text
    • http://pifanaliriwabo.mygamesonline.org/the_black_legion_40k.pdfIn PDF document text
    • http://lugodapamaj.mygamesonline.org/ccps_guidelines_for_auditing_process_safety_management_systems.pdfIn PDF document text
    • http://tebogekememesij.mygamesonline.org/82415345373.pdfIn PDF document text
    • http://wedevaz.sportsontheweb.net/menciona_8_caractersticas_del_modo_de_produccin_feudal.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://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_52f910fa5e7c43279803e8ac50f51c0e.pdf?index=trueIn PDF document text
    • https://bcbc83ff-a82b-4234-bf1d-c69e8cae54d5.filesusr.com/ugd/057c82_58a4b5a679ea45d6ad0ab1c8bd269d5c.pdf?index=trueIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_c5dd33e94c934e738dae75c3b3663195.pdf?index=trueIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_506bbfa0e7c34851b5cac07ac247fd59.pdf?index=trueIn PDF document text
    • https://b9264059-5ce6-458a-812b-58b21e0c51d1.filesusr.com/ugd/9a3dc1_7091ee69616e4fe99a89c901e63c096e.pdf?index=trueIn PDF document text
    • https://564fd4a8-0e6d-4f97-813a-a14a70c45316.filesusr.com/ugd/f90d28_57a2dd2f2311440d901559d10b4be9ed.pdf?index=trueIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_0c2d508a611646f685b9cae915c06cee.pdf?index=trueIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_ac27b7b395b44094b15d9ca4bb8c7bd1.pdf?index=trueIn PDF document text
    • https://3eeb541e-75be-486c-a732-b1e279b2a932.filesusr.com/ugd/eaab1c_3eddd9f66cf84079b9bdc05a42ed9383.pdf?index=trueIn PDF document text
    • http://xifimerin.onlinewebshop.net/31180029365.pdfIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_2327d8884b014b23b14ac55148ac89eb.pdf?index=trueIn PDF document text
    • http://vujuvisesakok.myartsonline.com/how_to_light_pilot_on_williams_wall_furnace.pdfIn PDF document text
    • http://jemukiguwuw.myartsonline.com/sigozusidurunumelip.pdfIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_ad32bff37ae4472f841f8fbe3597798b.pdf?index=trueIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_2cc713ae7a2741f492e81e24dd9f8b72.pdf?index=trueIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_aa259886c6b348f08a54c97667400007.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_off0000f098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF098 5424 bytes
SHA-256: 936367803164c308bc1a0e0f87f57b52c54007f557edfdde0f3ad68354204156
font_01_sfnt_off000102f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F9 10900 bytes
SHA-256: 11d6aaa2c13b8805244d44226a9c291744b54595f778cecdcb12ef08e9d1f4c8
font_02_sfnt_off000127e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E2 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34