Malicious PDF — malware analysis report

Static analysis result for SHA-256 13618523e85af3d4…

MALICIOUS

PDF

75.0 KB Created: 2021-05-24 21:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 813f749963574b9cf332476d3ca56905 SHA-1: 9c28137c041b4cce34fd392ff8b221c96b060852 SHA-256: 13618523e85af3d4864d09e57d24d02720f9dab444896055047eccd535552eee
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://seumenha.ru/strik?utm_term=what+are+your+strengths+skills+and+abilities PDF link annotation
    • https://nimivumunekal.weebly.com/uploads/1/3/3/9/133999229/2694374.pdfIn PDF document text
    • https://ripukalogud.weebly.com/uploads/1/3/4/3/134391837/9841886.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/3821665.pdfIn PDF document text
    • https://fifikasato.weebly.com/uploads/1/3/1/4/131437502/kogoxobejutugiwod.pdfIn PDF document text
    • https://mogoxolokelitaf.weebly.com/uploads/1/3/4/6/134645696/3774039.pdfIn PDF document text
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/safutugufaximad.pdfIn PDF document text
    • https://kujegafibez.weebly.com/uploads/1/3/4/2/134265926/jeravugow-mukufemale-sipovonavabunu-devagaxorawa.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/taturi/2570416028.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/50179422913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b45f2443-1ad6-4ce4-99c5-67a9a6355257/renakejelelodozuvaxize.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/converting_recurring_decimals_to_fractions_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/21977391861.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/bone_tv_series_episode_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/973797f0-f631-46e6-8684-f4f89951dfa2/why_is_my_vivitar_speaker_beeping.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/secured_promissory_note_template_california.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/c_language_tutorial_for_beginners_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/91503976507.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eec29bea-75ae-44a6-b876-e1e195d0cb40/streaming_catch_me_if_you_can_sub_indo.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/origami_flowers_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/38889091648.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/what_is_the_best_piano_lesson_book_for_beginners.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_off0000e927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE927 5408 bytes
SHA-256: a05b6ff0c1322922975fb000b26b3a8dd8f5db0a7d71cb4007a96315236c2d05
font_01_sfnt_off0000fb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 10288 bytes
SHA-256: 12d4e4195b9343797f5c422198eaafaefce24ec7d7e04f9fbe2206c5613be968

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