Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13d6261c9364458…

MALICIOUS

PDF

84.5 KB Created: 2021-01-11 15:02:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e1310315af5e23b80b620f91fc99dd77 SHA-1: 94b5b63ea4c200b4d2e13e95654ecf0c0f10c20c SHA-256: c13d6261c936445850e46f46f4ba36b89a5b2fcd1f75dd218bbc5b8063e55229
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt, likely delivered via spearphishing attachment.

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 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://trafffi.ru/aws?utm_term=bein+sport+connect+apk+pc PDF link annotation
    • https://cdn.sqhk.co/fuwunikuneg/bYTieAK/cannondale_xct_bike.pdfIn PDF document text
    • https://site-1166064.mozfiles.com/files/1166064/dewalt_1400_radial_arm_saw_manual.pdfIn PDF document text
    • https://site-1176713.mozfiles.com/files/1176713/sms_ringtone_download_new_tamil.pdfIn PDF document text
    • https://site-1168299.mozfiles.com/files/1168299/88506281622.pdfIn PDF document text
    • https://cdn.sqhk.co/lokijuzim/fcGjf9e/16510037044.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/ugiKhtK/9463691502.pdfIn PDF document text
    • https://site-1166708.mozfiles.com/files/1166708/28151616409.pdfIn PDF document text
    • https://cdn.sqhk.co/kezavilageg/ighghjt/drumsy_emi_face.pdfIn PDF document text
    • https://site-1177197.mozfiles.com/files/1177197/2526801006.pdfIn PDF document text
    • https://site-1228702.mozfiles.com/files/1228702/diwepubi.pdfIn PDF document text
    • https://site-1176519.mozfiles.com/files/1176519/47493492656.pdfIn PDF document text
    • https://site-1168096.mozfiles.com/files/1168096/tisositazenozo.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/gupojakami/52295590689.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/subekovovukupimoferijofur.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/vovox.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D4 5008 bytes
SHA-256: 2712816e723e51adc09a01075282b059c460f057a17d13a19cf957be04deb7d0
font_01_sfnt_off000106f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F3 12632 bytes
SHA-256: c58cd9b4f62261325cc54ef280c4e13abf4fb1df0d792a2f14aad0bc5e9e31ae
font_02_sfnt_off00012ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF0 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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