Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9bfe194da1755a…

MALICIOUS

PDF

78.8 KB Created: 2021-01-08 13:42:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 253c3b589b44de5a0e3dc0b5e0441289 SHA-1: b1917863861e59682a720a33463b51ad7ea5209a SHA-256: 6c9bfe194da1755a2650c7bdcfcf206190673167e1d0daec59cf2c17d3111bc3
244 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with multiple heuristics identifying it as a link farm. One critical heuristic specifically flags links to known malicious redirector infrastructure, such as 'traffmen.ru'. The presence of numerous links on disposable hosting services further supports the malicious intent, likely to lure users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=nih+laboratory+design+guidelines In PDF document text
    • https://lilugotowo.weebly.com/uploads/1/3/2/7/132711957/9664107.pdfIn PDF document text
    • https://fuwanitawoge.weebly.com/uploads/1/3/4/4/134436239/7119152.pdfIn PDF document text
    • https://rutobugexamaxip.weebly.com/uploads/1/3/4/5/134508198/0a53d57547b.pdfIn PDF document text
    • https://cdn.sqhk.co/rogumabutur/KjfJibG/itel_mobile_dialer_code_for_samsung.pdfIn PDF document text
    • https://jufozovujibozom.weebly.com/uploads/1/3/4/3/134360308/sulade_mafeganel_jibizewijupe.pdfIn PDF document text
    • https://cdn.sqhk.co/jedetanepiz/Pijhfgj/crackles_in_lungs_sound.pdfIn PDF document text
    • https://kumakisatosoref.weebly.com/uploads/1/3/5/3/135328720/bec86a986a24333.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/ddb27c6b-b1ea-48ab-8100-da59d5b49605/gowikotogejotuzugabatozu.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/capacitor_codes_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62ea29e0-d69d-4e79-857f-7df05e9ff347/86598316323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a60ed550-7c05-44d3-80c8-ce90e6fcfe93/intermediate_microeconomics_with_cal.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/capital_structure_notes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA31 5180 bytes
SHA-256: 2d779146dd8e83e7bc1e77dca0c7f9b339130c93f149f0d169558424b3bddd71
font_01_sfnt_off0000fbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC4 10552 bytes
SHA-256: 349aaa0f571a167a1c65285145974044775ab2f4135175c11b7ee0c5fecc36f5
font_02_sfnt_off00011fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE6 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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