Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e9d81997922c0fe…

MALICIOUS

PDF

74.6 KB Created: 2021-01-11 01:28:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d8f5d8167cb2ff1eba0b2cd30d9c69ab SHA-1: 9d2206448f7020748563b2d296d280db194d5b0d SHA-256: 6e9d81997922c0fe971fb2a98420cf9d58c44b38993dc8a39017a4fe62f6d33e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafficel.ru/123?utm_term=love+is+overrated PDF link annotation
    • https://cdn.sqhk.co/bogulevim/digajpt/misitazi.pdfIn PDF document text
    • https://site-1174552.mozfiles.com/files/1174552/86415701548.pdfIn PDF document text
    • https://site-1175399.mozfiles.com/files/1175399/sigajoxenup.pdfIn PDF document text
    • https://site-1172155.mozfiles.com/files/1172155/bigfoot_pubg_hack_apk.pdfIn PDF document text
    • https://site-1178325.mozfiles.com/files/1178325/maxaxosikapixerewakot.pdfIn PDF document text
    • https://roxuvipiga.weebly.com/uploads/1/3/4/6/134637137/dc9dc23a.pdfIn PDF document text
    • https://site-1171473.mozfiles.com/files/1171473/zombie_apocalypse_gta_san_andreas_mod.pdfIn PDF document text
    • https://xuxulavadimuxa.weebly.com/uploads/1/3/4/2/134234789/fd4d290ba41ca0.pdfIn PDF document text
    • https://site-1174586.mozfiles.com/files/1174586/49597452169.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/gupuso/76811660408.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/41590963271.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C9 4788 bytes
SHA-256: 032d467c6c6d1c4c1f7e533001efce45bc432948da6e0de1549dd1a071cda381
font_01_sfnt_off0000fa20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 10556 bytes
SHA-256: 5a3af6e6ac4fb13026d3022d68b73ecf3c8061996433c3342522eea4f93a00df