Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e2470892ad7b5d…

MALICIOUS

PDF

91.5 KB Created: 2021-01-10 03:12:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 77af25d387d721aec94bf3f65901e5e1 SHA-1: 8ae202c646850f15065d788422379009f185e9ba SHA-256: a4e2470892ad7b5d775cc1479690b990868d19f883356f6dd051388343e3a1e6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://trafffi.ru/123?utm_term=fiscal+policy+paper+eco+3720', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to malicious content.

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://trafffi.ru/123?utm_term=fiscal+policy+paper+eco+3720 PDF link annotation
    • https://site-1175608.mozfiles.com/files/1175608/vusepitow.pdfIn PDF document text
    • https://site-1177931.mozfiles.com/files/1177931/23556203789.pdfIn PDF document text
    • https://cdn.sqhk.co/vobipibomuk/atCcTji/32659835966.pdfIn PDF document text
    • https://site-1167971.mozfiles.com/files/1167971/electromagnetism_basic_physics.pdfIn PDF document text
    • https://site-1166704.mozfiles.com/files/1166704/felarilet.pdfIn PDF document text
    • https://site-1178275.mozfiles.com/files/1178275/learn_electrical_wiring_online.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/8phiygg/titaromorotununozojadad.pdfIn PDF document text
    • https://zazafiwizodizi.weebly.com/uploads/1/3/4/0/134041258/7294774.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/gajakelegeza/wowojesepasakuze.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/nuvabimabijipawubiwaz.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/47192934608.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/xugukuzosuvume.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/11th_bio_botany_practical_book.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013172.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13172 26716 bytes
SHA-256: 23d814f34ae0b280744941fb8f150f480e09d95e0c3efa5783c69bceddd07230
font_00_sfnt_off0000f945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 5500 bytes
SHA-256: bec1bd11264205701d0179d304168358eaa23d8dff06e42bd88c82598eefce8b
font_01_sfnt_off00010c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1C 11364 bytes
SHA-256: 148bf0f78ccae426adc21d7057f30ef48e2a4a42b0efd411c690cec763b23b44

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