Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c04f58101f1d74…

MALICIOUS

PDF

89.5 KB Created: 2021-03-03 07:19:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 4e93cc7ee4d3e16706efda066d356cff SHA-1: 6e137da28de92a592cd50b0e204412a846b3201d SHA-256: 21c04f58101f1d741fdcd30d1ac2e033bd9134a22a484443606b28b489754ee7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a 'PDF link farm'. The document body mimics a search query, suggesting a tactic to drive traffic to these external sites. While no scripts were explicitly extracted, the presence of multiple external URLs and the ML classifier's high confidence score indicate a malicious intent, likely related to SEO spam or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://druttle.ru/award?keyword=how+many+bosses+in+dark+souls+3+with+dlc PDF link annotation
    • https://samaruwopag.weebly.com/uploads/1/3/0/7/130738554/vinof.pdfIn PDF document text
    • http://wewuped.iblogger.org/streaming_video_android_firefox.pdfIn PDF document text
    • https://wijirejilape.weebly.com/uploads/1/3/2/8/132816202/gekizegezakatotib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vijuzoluza.epizy.com/report_starbucks_gold_card_lost.pdfIn PDF document text
    • http://sakiwut.rf.gd/muzaladasijotag.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/kokuwemuk.pdfIn PDF document text
    • https://s3.amazonaws.com/vosimalume/anime_battle_cosmos_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/100_aos_de_soledad_primera_frase.pdfIn PDF document text
    • http://lakutinegodoted.epizy.com/67837371767.pdfIn PDF document text
    • http://sanozevu.rf.gd/colonial_of_zeeland_grandmother_clock.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/4197743146.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/49281137835.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/94747755906.pdfIn PDF document text
    • http://nowuvopejolek.rf.gd/bible_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/65056327242.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/70617570827.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_off000113ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BA 3600 bytes
SHA-256: 48862326178c9e2905e5d0c7f84f708c4b0e2274cf7fdade00e6848db9728dd2
font_01_sfnt_off00012097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12097 5700 bytes
SHA-256: f905a70bfd772832694a4bc45133ffa1e94b88bfc54cb6ea620c9cd30bb343af
font_02_sfnt_off000133e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E7 10644 bytes
SHA-256: 32535f4aff8c51747da031c407dbb7a2ce1ccceb093d3d0f6b387f57cb5c1a2a

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