Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a9b14ad03f44254…

MALICIOUS

PDF

80.4 KB Created: 2021-01-06 21:03:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 782f2ea033a2a4c54cb7634c031a9f4e SHA-1: 371972f3b901c934c84a852f9a1671266b9f62bd SHA-256: 6a9b14ad03f4425478f503b8d3ab2d253b9ca6fb8369ae63ffd55d321727b5c8
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with the heuristic 'PDF_SEO_LINK_FARM' indicating a mass of 30 external PDF links. One of these links points to 'https://traffset.ru/aws?utm_term=apeman+a77+firmware', which is flagged as suspicious. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

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://traffset.ru/aws?utm_term=apeman+a77+firmware PDF link annotation
    • https://xizirogubo.weebly.com/uploads/1/3/0/7/130776043/15f52219.pdfIn PDF document text
    • https://cdn.sqhk.co/miwataxanis/ajiShhI/hidden_object_psalms_91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369503/normal_5fa3d7ebcf30a.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/zodilonokogurun.pdfIn PDF document text
    • https://zasoliwex.weebly.com/uploads/1/3/5/3/135318241/mirikojiwixejig.pdfIn PDF document text
    • https://lowijagaji.weebly.com/uploads/1/3/4/3/134394878/veletevesigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_5fbd84b17cd9e.pdfIn PDF document text
    • https://pesasujax.weebly.com/uploads/1/3/4/8/134882000/rotino.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/how_to_read_powercfg_battery_report.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/pavawegirotofiwuwuj.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/58213145395.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/excel_bedingte_formatierung_formel_ungleich.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/nefojami.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/13451465384.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/medication_adherence_report_scale_mars.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://www.gnu.org/licenses/gpl.htmlIn 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_off0000e91e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE91E 13456 bytes
SHA-256: e4fbc6b0d0e999e7fa04cb6b87112660a05a4ea98e0ea204b69c7213480b3f9d
font_00_sfnt_off0000d824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD824 4996 bytes
SHA-256: b9a5f9c3c3b536ec53668932faddc1156276b9046fa34c203fc791a01fed5bea
font_02_sfnt_off00010f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F83 10676 bytes
SHA-256: 2e2c15151502b25f694c84b4307a2fbec2c1ff4178e80569b99095c17dbeb65e

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