Malicious PDF — malware analysis report

Static analysis result for SHA-256 138f8e1bcc63e099…

MALICIOUS

PDF

67.5 KB Created: 2021-02-23 18:05:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d3db1938f88588e2923fee115f392ec0 SHA-1: e0355c53d6b7c9c896b7d32cec2ef6527bb817dc SHA-256: 138f8e1bcc63e099b48c075e4db3c1418cf60db36bf142db6bd1334c4ab8896d
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing attempt. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to a service manual, aiming to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=roland+r+880+service+manual PDF link annotation
    • https://cdn.sqhk.co/kurotevu/difgghi/34296463755.pdfIn PDF document text
    • https://jukovuwivoxufab.weebly.com/uploads/1/3/3/9/133997180/f47890d7a143.pdfIn PDF document text
    • https://cdn.sqhk.co/nesadatifu/uiihjvh/32288836255.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/bsjgclJ/rocket_car_racing_apk_game.pdfIn PDF document text
    • https://towuzisutodugo.weebly.com/uploads/1/3/0/9/130969847/bawemajav_warevulatefap_pajukusedosaru_setop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451555/normal_5ff90dd920746.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/jjigh0L/hd_wallpapers_1080p.pdfIn PDF document text
    • https://cdn.sqhk.co/bexamajuw/ZMQ0ifR/wipesupis.pdfIn PDF document text
    • https://cdn.sqhk.co/tuminageka/gC7Mhhd/kleptodogs_who_let_the_pups_out.pdfIn PDF document text
    • http://nesobaka7.xyz/fevaxe0y8hm.pdfIn PDF document text
    • http://dutov.org/algorithms_robert_sedgewick_drivem2ilc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470542/normal_6015e7960377d.pdfIn PDF document text
    • http://maturibcgj.space/pangngalan_pantangi_pambalana_worksheetskj11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411694/normal_5ff01870813bc.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://s3.amazonaws.com/tifuwuw/7133201182.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD5 5292 bytes
SHA-256: 30a921a78ad9030ad7199699df224627cb2da1a8461df120be371e44e508574b
font_01_sfnt_off0000cdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAE 11008 bytes
SHA-256: e2b5d4cba2993b4c8da7a227f2cd80d7f77376313d1721fa1ce1417b7258da70
font_02_sfnt_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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