Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9f014a3d48b8bc…

MALICIOUS

PDF

62.2 KB Created: 2020-12-11 14:21:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1210cddf4b86a39ab56a692b9ce88ad3 SHA-1: 92f09e692793b29cb63ce181c21ca1c352508c43 SHA-256: 7a9f014a3d48b8bc16fc19ec19cf3c7b340a0da620e6e32cc19469ac02b82814
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and other domains, indicative of a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffking.ru/aws?utm_term=year+3+science+magnets+worksheets
    • https://rigavedisibabaz.weebly.com/uploads/1/3/4/9/134902328/f82d2b3f1fd678.pdf
    • https://wegotutitupal.weebly.com/uploads/1/3/1/4/131453182/laberures-zuzewekuselobe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fasomusogapovi/64183579007.pdf
    • https://s3.amazonaws.com/godoremitiwuja/understanding_demand_and_supply_shifters_worksheet.pdf
    • https://static1.squarespace.com/static/5fc0ba3b0a2757459be1f9cb/t/5fc0f011f3de5e49b5862dba/1606479889675/six_feet_under_billie_eilish_lyrics_eviri.pdf
    • https://s3.amazonaws.com/rudelazifizuvo/fezelinutegukin.pdf
    • https://s3.amazonaws.com/wovugi/39330853674.pdf
    • https://uploads.strikinglycdn.com/files/fc768536-e584-4538-87ce-9a0dd877e05c/febozasevo.pdf
    • https://s3.amazonaws.com/jarawaxanivu/bibliotecas_virtuales_definicion.pdf
    • https://s3.amazonaws.com/dejazuvorira/mipure.pdf
    • https://uploads.strikinglycdn.com/files/3dd6772e-371d-4668-803c-62aa8025282b/elsir_vale_player_map.pdf
    • https://s3.amazonaws.com/gaxuremewuger/90426378654.pdf
    • https://uploads.strikinglycdn.com/files/6147eb6d-7d27-4b19-a659-5a7ac17b654d/foreshadowing_and_flashback_worksheet.pdf
    • https://s3.amazonaws.com/figugipopar/bedegodekamivewirakevafoj.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_off0000b6e0.bin
6a19aa8c8235afcfb29867c81261cc6bef050d1d319d1aa41334c1f218670790
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E0 5464 bytes
font_01_sfnt_off0000c962.bin
1bcaa9be4cfe7dd890f3403b636bdb1191283077a59d4862c90d5ba981751799
pdf-font-stream PDF embedded font (sfnt) at offset 0xC962 10132 bytes