Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f610c136adf5f6…

MALICIOUS

PDF

83.1 KB Created: 2021-05-30 04:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 38c985ea84e109ec01937c4615332df6 SHA-1: 255909247b75a47f9bc2863705f8cda47da62a49 SHA-256: b6f610c136adf5f6b68c680f0478051deec425fe258f8159ae41a7c8cb6128af
186 Risk Score

Malware Insights

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

The file is a PDF containing a large number of external links, many pointing to disposable hosting services, indicating a link farm. The presence of a URL with 'renunciation form' in the UTM term suggests a potential phishing lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://lozipotod.ru/strik?utm_term=renunciation+form+rw-06 PDF link annotation
    • https://zezupivipikoko.weebly.com/uploads/1/3/4/5/134596705/xibabetatutekubij.pdfIn PDF document text
    • https://bovefunovowuto.weebly.com/uploads/1/3/0/8/130873908/6828482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505837/normal_5fe718828bb4c.pdfIn PDF document text
    • https://wezusewowanura.weebly.com/uploads/1/3/4/2/134235680/napuvepakepu.pdfIn PDF document text
    • https://sufafiderek.weebly.com/uploads/1/3/0/8/130814754/rofimukavamut-xesuzuwuvifedo-jirusaxaki-xufoz.pdfIn PDF document text
    • https://degulula.weebly.com/uploads/1/3/1/0/131070998/160d0e72ae0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408336/normal_6003645fc8d91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487916/normal_606dd740b86d4.pdfIn PDF document text
    • https://wamibujobaju.weebly.com/uploads/1/3/4/7/134716207/13de8eff93d8.pdfIn PDF document text
    • https://pupaxuge.weebly.com/uploads/1/3/4/0/134096873/raxature-mivulixuzigirow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417033/normal_601cbe59e303c.pdfIn PDF document text
    • https://jeluxipofike.weebly.com/uploads/1/3/4/4/134490416/wizobazigosanoperik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393018/normal_601cddbfc0329.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://uploads.strikinglycdn.com/files/1816f56e-52de-47e6-9136-5936fedf4b41/navirulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd877484-ed4c-47af-947e-8f431efb23e4/4370073969.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b97875b7-7e4f-4a07-a90a-00b08825bcdd/the_second_sex_summary_gradesaver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaf04939-56d3-44d5-b091-8c5a5f923d66/what_is_the_use_of_diffraction_grating.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fc28a79-29d2-4db3-be26-119547f9f610/86903860183.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec01165d-ca58-4a30-961b-803b03b1b809/zetinakezevom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cb96352-c397-4240-8e53-8e1bec0e3dd9/rimoxututiwujeximalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f44a3a0d-ba67-45fe-ac6c-97dfc7c13401/jejekekekevekoweru.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE444 5128 bytes
SHA-256: 66b08779fbd8a449eff09f58ea5a1b448a4cc34f23c0e3b07fa19d65f7d2c5cd
font_01_sfnt_off0000f5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 10568 bytes
SHA-256: fa79b5101460b39505c0938cb0b424614b39e219cf4522ce6c8288b708ef7564
font_02_sfnt_off00011a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4F 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2
font_03_sfnt_off00012f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F16 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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