Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5257990fab6d2a0…

MALICIOUS

PDF

65.9 KB Created: 2020-12-21 13:41:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ad67cd15dc28e143fc6f2847c1ebc92 SHA-1: d5159cce8626d27bc97b2bd1c01101efb02e255d SHA-256: d5257990fab6d2a00395e8a6b5559131ba95bda5d1964d610e75560787aad01e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML score, indicating malicious intent. The presence of an external URI pointing to 'trafftec.ru' suggests a phishing or scam lure, likely disguised by the document's apparent content. No scripts were extracted, but the PDF structure and heuristics strongly indicate a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/strik?utm_term=word+cookies+strawberry+special+level+1
    • https://zokunokakepano.weebly.com/uploads/1/3/4/3/134353677/1339f443c2d6b1.pdf
    • https://static.s123-cdn-static.com/uploads/4462993/normal_5fc623591e014.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8e77a915-e8e1-46c3-960d-5d6fcab35edd/60211790079.pdf
    • https://uploads.strikinglycdn.com/files/04d55c5d-79cd-4614-b2fc-89aca67a0a64/xifumowa.pdf
    • https://s3.amazonaws.com/votubukaxogilix/new_cg_song_dj_2018.pdf
    • https://uploads.strikinglycdn.com/files/1cc48640-ad42-414e-8c26-0b50e91ec029/le_roman_comique_scarron_analyse.pdf
    • https://s3.amazonaws.com/midizaxopazeji/between_maybes_2019.pdf
    • https://static1.squarespace.com/static/5fc599753398ff75154dc615/t/5fcd8302662d5e24e0ba05f5/1607303939130/bird_life_quotes.pdf
    • https://uploads.strikinglycdn.com/files/192d5306-0e0f-4eff-9b91-eab732767ffb/the_revenant_stream_free.pdf
    • https://uploads.strikinglycdn.com/files/bedc6e6e-7389-446b-abce-9770990f697e/gloves_of_thievery_5e_attunement.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf594bf8cdb769c6da0926/1606375755891/uniden_cordless_phone_manual.pdf
    • https://s3.amazonaws.com/setikizo/baby_day_out_punjabi_dubbed_movie.pdf
    • https://uploads.strikinglycdn.com/files/84a644ad-7c6b-463e-b4ac-5e1d0b641152/sesujilatejadebipaw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c47a.bin
23513e2ac67d252bd8b1d49a62f436ff2699acdf7d10c0e95ecc4531bcdab1ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xC47A 5588 bytes
font_01_sfnt_off0000d7b3.bin
02f13ecb00aa2239f77af295ff563287ecaff614b97c298194c2ced751272481
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B3 10272 bytes