Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f6bcb35ddb3f47…

MALICIOUS

PDF

65.0 KB Created: 2021-02-24 20:39:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bf43b47bcc35db9bee5de6c930dcf64b SHA-1: a6b86094a9309f50173c906b97ccf1c2dc65c653 SHA-256: 03f6bcb35ddb3f4701972f5efc97e7fda4e8d19f957d72d517b9456a6a2a2007
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, characteristic of a link farm, and is flagged by ML classifiers and ClamAV as malicious. The embedded URLs suggest a phishing or SEO manipulation attempt, likely to direct users to malicious content or further stages of an attack. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=the+fox+and+the+hound+parody+wiki PDF link annotation
    • https://cdn.sqhk.co/gunakawujo/IFqaijZ/winter_warmer_recipes_healthy.pdfIn PDF document text
    • https://cdn.sqhk.co/womawuxinuge/1hdja6V/physics_class_9_chapter_1_mcq_test.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/somewhere_over_the_rainbow_ukulele_chords_strumming_pattern.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/geSghXA/suzizizujukorumuxogu.pdfIn PDF document text
    • https://cdn.sqhk.co/lepudijazur/ii7tbJy/stage_4_pancreatic_cancer_survival_rate.pdfIn PDF document text
    • http://freshmind.net/the_signal_and_the_noise_downloadznsm3.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/6KNWjb2/spotlight_room_escape_underground_no_water.pdfIn PDF document text
    • https://tigakivukabor.weebly.com/uploads/1/3/1/1/131164093/1c143.pdfIn PDF document text
    • https://koworuvixoduto.weebly.com/uploads/1/3/4/3/134352933/826bc5a.pdfIn PDF document text
    • https://linefalaxig.weebly.com/uploads/1/3/2/6/132682404/lebaf.pdfIn PDF document text
    • http://zevewidojodot.mywebcommunity.org/84851803099.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/tengakhat_dibrugarh_weather_report.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_off0000c4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EF 5196 bytes
SHA-256: b005212df714dbac08ebca0d3c4ee30f96baf1cb765ad856946b598877a2b994
font_01_sfnt_off0000d6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B3 9564 bytes
SHA-256: 81cd83845d4d9a7aac4a42881f347af54789297282522f812c305258e83ca700

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