Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a10cc395facdc94…

MALICIOUS

PDF

71.3 KB Created: 2021-02-18 11:45:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: aaf2386b23ae13418481844213bdf68c SHA-1: caf079d1ac408715fe15aea1bdfc1ccf659178f8 SHA-256: 9a10cc395facdc94e5de72427da6e4bff5dc714eea84746280fdfb59a135bf9f
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, embedding numerous URLs, with one notable URL containing SQL error-like parameters. The document body, though heavily obfuscated, contains references to wkhtmltopdf and date/time information, suggesting it was generated programmatically. The presence of embedded URLs and the link farm heuristic strongly suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/123?utm_term=sqlcode%253D-911+sqlstate%253D40001+sqlerrmc%253D68 PDF link annotation
    • https://zujujogonawanuk.weebly.com/uploads/1/3/4/8/134879196/jemukatarirowusedut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461791/normal_600f4079da60c.pdfIn PDF document text
    • http://mestorating.ru/zobeniwijilujorajumigitukx5ofy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469623/normal_60126385c8b26.pdfIn PDF document text
    • http://genusttwsr.fun/driver_booster_5_pro_serial4nrty.pdfIn PDF document text
    • https://wilowukodol.weebly.com/uploads/1/3/4/8/134881933/litov-darazuputus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425915/normal_5ff6d0d085eaf.pdfIn PDF document text
    • https://degusatujetuz.weebly.com/uploads/1/3/0/8/130813325/mokezagebafi-gukafuvevagavo-gutaki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370530/normal_5fcc7617e20e8.pdfIn PDF document text
    • https://fimedezederuru.weebly.com/uploads/1/3/4/8/134884956/2033052081c8894.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426262/normal_5ffb14906a3fe.pdfIn PDF document text
    • http://blognews.top/lopejolatexidiliraludoxedqxal4.pdfIn PDF document text
    • http://help-verification.com/gowikafeni07ur9.pdfIn PDF document text
    • http://lifegirls.site/monster_jam_steel_titans_ps4_pricex0n0k.pdfIn PDF document text
    • http://pajiweputuniwas.iblogger.org/konsep_pendidikan_islam.pdfIn PDF document text
    • http://hightrade.club/4pic_1_word_level_23_answerj6ruw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jegowijuvu.epizy.com/sistem_bilangan_bulat.pdfIn PDF document text
    • http://kawojimulogizef.rf.gd/ammi_ammi_song_kannada.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_off0000d49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49C 6180 bytes
SHA-256: 1b417941c7a6b7b33c703281aaffad3a9edc4dcff58d664a3379fc164ded2169
font_01_sfnt_off0000e98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98E 11360 bytes
SHA-256: 81d39e104be98fdacf33a7d2518a39b05f0255814070a9a8e848ef60183cc2bc

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