Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a6854066ff78e7…

MALICIOUS

PDF

72.3 KB Created: 2020-12-27 10:06:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: be2b828db76901639a34c85d35837659 SHA-1: 13691dbdd994b3e02fe1eb355946ef6417fe950f SHA-256: b5a6854066ff78e7ff5ae05bc875a74247a888a9e796a0c2cd98405f1557374f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs, such as 'https://traffnew.ru/strik?utm_term=mahalaxmi+calendar+november+2020+pdf', are likely used to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself is weaponized.

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 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://traffnew.ru/strik?utm_term=mahalaxmi+calendar+november+2020+pdf PDF link annotation
    • https://sedezexe.weebly.com/uploads/1/3/4/3/134342112/b2b41354520b5c.pdfIn PDF document text
    • https://xesilowavexaweg.weebly.com/uploads/1/3/4/2/134265648/kixoroxunawaja.pdfIn PDF document text
    • https://karegito.weebly.com/uploads/1/3/4/6/134626514/7825189.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/fevebixome.pdfIn PDF document text
    • https://fudosabitewixo.weebly.com/uploads/1/3/1/6/131636852/9749395.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465128/normal_5fe37ff666e8a.pdfIn PDF document text
    • https://fitarobut.weebly.com/uploads/1/3/4/6/134690469/vodakizezuku.pdfIn PDF document text
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/1170834.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368999/normal_5fe6614a6ef5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375356/normal_5f94beec626fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408719/normal_5fc8b83bd2cab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/sparkly_animated_food_gifs.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/classical_dance_video_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/dezozosuru.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/chemistry_of_life_test_study_guide_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/valkyrie_crusade_leveling_guide.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_off0000c5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FE 5764 bytes
SHA-256: 7f8ae5a4cd1b35660290c386b3b2d5e79d421c4ef5184d8d1e08d2962673d100
font_01_sfnt_off0000d97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97F 9848 bytes
SHA-256: 7fc441e4a27600d937b118e8fa87fa400606ab7616a688b6fc9a64e21a67b2e8
font_02_sfnt_off0000fb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB70 6304 bytes
SHA-256: c163e340adf1f2479d5bbd5ade4392ea4656e3221c772c11f660b125ba29468d

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