Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d1127df93c71a2…

MALICIOUS

PDF

80.8 KB Created: 2021-01-10 03:34:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 4f2b10faa285977e8f831df80e41b181 SHA-1: b1368599c229802565e14523554d1a5eff8bb2f0 SHA-256: 79d1127df93c71a29c19656634622cccf586207dfd1d0beaf218e3a8f2185e79
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The presence of a 'utm_term' parameter suggests a phishing or advertising campaign. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lead users to malicious or scam websites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://traffset.ru/aws?utm_term=video+live+wallpaper+setting+pro+apk PDF link annotation
    • https://cdn.sqhk.co/kelopifagisu/fjjfjjD/vekisugaz.pdfIn PDF document text
    • https://site-1171384.mozfiles.com/files/1171384/jarara.pdfIn PDF document text
    • https://site-1168242.mozfiles.com/files/1168242/kalezipag.pdfIn PDF document text
    • https://kinojapi.weebly.com/uploads/1/3/2/3/132302846/wigugodituse.pdfIn PDF document text
    • https://ginadilu.weebly.com/uploads/1/3/4/7/134768391/fizinute_ronogoxepor_vugojobolujole.pdfIn PDF document text
    • https://titezexi.weebly.com/uploads/1/3/4/6/134639754/7049032.pdfIn PDF document text
    • https://xopavomubikun.weebly.com/uploads/1/3/4/8/134879687/6908792.pdfIn PDF document text
    • https://xewaxamuroz.weebly.com/uploads/1/3/4/5/134529724/fatinonot-wopisumonumig-nikit.pdfIn PDF document text
    • https://site-1174602.mozfiles.com/files/1174602/37542643913.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zonivezada/xuzanixunabawugezuroter.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/24976937266.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/betoxod.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AE 5096 bytes
SHA-256: d0f5439659cd3cd782a1432fd8ba9a6db954c68a05cb455fc8c5e3b4679a9464
font_01_sfnt_off0000f41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41C 4288 bytes
SHA-256: 56c9a95bffdc7bc1c544142b3f76182e63c2e9afc2f9de3065c81c16e10ad689
font_02_sfnt_off0000ffb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 12244 bytes
SHA-256: 898e2bb1df9b156b0b5694936240d6709f3917de0112fb2ddcd982004e5acb88
font_03_sfnt_off000127d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D9 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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