Malicious PDF — malware analysis report

Static analysis result for SHA-256 0213afdfe72816c8…

MALICIOUS

PDF

76.3 KB Created: 2021-03-22 21:16:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6835e6540915197a5fa3fb713380ca80 SHA-1: c38e7089ffb8223d06ce39b04774e46ec74d4d41 SHA-256: 0213afdfe72816c8c96d3b49675745e7a62ecc795b0ff488bb661165ee6ba1b1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, containing a large number of external links. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the presence of numerous external URLs, including one pointing to 'botokaw.ru', suggests a phishing or malicious redirection attempt. The document body is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://botokaw.ru/123?utm_term=fresh+lasagne+sheets+where+to+buy PDF link annotation
    • https://cdn.sqhk.co/kepigofunet/hcE7xTO/volenagupuzefamekazi.pdfIn PDF document text
    • http://degakak.sportsontheweb.net/bulfinch_s_greek_and_roman_mythology.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/egfjijb/72751837417.pdfIn PDF document text
    • https://cdn.sqhk.co/naxudufejik/hgSw7hj/gejajiwususagezato.pdfIn PDF document text
    • http://xivoxuvawet.iblogger.org/whats_the_weight_limit_for_infant_car_seat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402507/normal_6016a5ceab6a3.pdfIn PDF document text
    • http://pexulisinipev.sportsontheweb.net/giduvuvovesisezirifab.pdfIn PDF document text
    • http://xobilosusi.sportsontheweb.net/incremental_cash_flow_analysis.pdfIn PDF document text
    • http://refarebadas.22web.org/53461021241.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379054/normal_602064e2976a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422386/normal_5fd78d9e2d865.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/e036c5ce-3d64-4d8c-b29c-8a0f9d1a9705/how_much_does_it_cost_to_ship_internationally_usps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f229024-5529-4d41-86da-bed888e3ec96/adobe_photoshop_tutorials_advanced.pdfIn PDF document text
    • http://temewafin.rf.gd/86985143162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be8b1ac2-9b3e-4015-82b3-f3f57f79288a/old_bridge_high_school_website.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32993105-78a1-4788-8df5-f80733ccb8a6/17303288231.pdfIn PDF document text
    • https://e3c65705-3664-417e-97b1-2ac29bfab8bd.filesusr.com/ugd/6a5da5_f70e13fa8dd24754b7c7972e54f2c173.pdf?index=trueIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_b8bec62da42a4a529e3c4e8fb21159d4.pdf?index=trueIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_5118e60fed064870a81ecd3636ebd3cd.pdf?index=trueIn PDF document text
    • http://tutalisog.rf.gd/coronary_heart_disease_drugs_list.pdfIn PDF document text
    • http://pojakopov.epizy.com/adhe_kangal_tamil_movie_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c8a5aa5-78cc-4a3a-8347-a61b79f82b47/43423408756.pdfIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_149235cfbbe34feda71d5d6eceb32d8b.pdf?index=trueIn PDF document text
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_7ac0438d12c14b7fb520d6dacf6a22e5.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_off0000ec1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1E 5236 bytes
SHA-256: 7d8b55fde607626b25bbaf4941d811af4d1d582a37bce3ba651ab208c9dbd5c4
font_01_sfnt_off0000fe02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE02 10508 bytes
SHA-256: 8875096fa07456223c2a0d3c3b714827585b53a86f1f39dda9e33748c037ee18

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