Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf8452d56dc7d87…

MALICIOUS

PDF

76.3 KB Created: 2021-04-06 07:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0eb0cf86d35c6c7590c28a1e2fbfb366 SHA-1: c6705d9bea32d35b64463e5bd205e836956b4e3c SHA-256: adf8452d56dc7d87c6b87117a0a426932eb81478a5875ba365914afdec927f83
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9753

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/award?keyword=qualitative+risk+analysis+pdf
    • https://dovejopizodumu.weebly.com/uploads/1/3/4/8/134883147/7098177.pdf
    • http://vijevejumozugim.sportsontheweb.net/20892841254.pdf
    • http://tejovotemikodes.getenjoyment.net/88327087472.pdf
    • https://sapixokevabose.weebly.com/uploads/1/3/4/4/134498139/6107544.pdf
    • http://fishing-rods2.club/easy_math_word_problems_1st_gradej0lcp.pdf
    • https://mobisikude.weebly.com/uploads/1/3/1/6/131606420/1901384.pdf
    • http://thrivewebs.com/sharp_carousel_convection_microwave_repairzvdls.pdf
    • https://zojujevekuki.weebly.com/uploads/1/3/0/9/130969212/mugiwowe_tunoxo_wikib_kedofedive.pdf
    • https://ratowoxure.weebly.com/uploads/1/3/4/5/134584599/279691.pdf
    • http://getporte.xyz/how_to_reset_asko_dishwasher_d5424h5y84.pdf
    • http://zilamuro.medianewsonline.com/educational_psychology_research_topics.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6d5e2a54-2d6f-4610-8573-ae281fb11e0f/fubikejadulagosibulud.pdf
    • https://s3.amazonaws.com/tedowafomaru/verozudifisufonek.pdf
    • https://uploads.strikinglycdn.com/files/11388f1f-521e-42a6-b062-861c25a8fed2/94022139260.pdf
    • https://uploads.strikinglycdn.com/files/77e96ffe-d784-4473-8ecc-87b9788e5379/wine_enthusiast_18-bottle_dual_zone_max_compressor_wine_cooler.pdf
    • https://uploads.strikinglycdn.com/files/4ce429c9-0f6a-4457-aca8-8c58a6c4922f/what_is_the_salary_of_digital_marketing_in_india.pdf
    • http://xonolori.atwebpages.com/87663499726.pdf
    • https://uploads.strikinglycdn.com/files/b6413bd9-9e14-4610-9205-4e8aadd0758c/menomifoxevonovubogepe.pdf
    • https://s3.amazonaws.com/mejobu/23038211628.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7c3.bin
b547a977531be803beb71e1465b32e04add301c1d0e462e752042da6240a1f04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C3 5324 bytes
font_01_sfnt_off000109fd.bin
69e5b664254bbe6b5c4e09de69515431d6c972081349b602ca3dc6f8e0dc47a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109FD 10332 bytes

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