Malicious PDF — malware analysis report

Static analysis result for SHA-256 350d6d1715bdf0a6…

MALICIOUS

PDF

102.9 KB Created: 2020-12-28 10:20:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3af4740839c6174c4ba39dff821cced1 SHA-1: 773cba2c2832f55518432ba298a365aca7cbb94a SHA-256: 350d6d1715bdf0a663bb11a0dad328008bab3dd08b2cbc5d300debd9b9a771dc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many of which are likely part of a link farm designed to distribute malware or phish users. The heuristic 'PDF_SEO_LINK_FARM' and the presence of multiple unknown URLs strongly suggest a malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://trafftec.ru/123?utm_term=glacier+bay+top+load+water+dispenser+manual PDF link annotation
    • https://xuvowesajitox.weebly.com/uploads/1/3/4/6/134603534/6e7f38da5600f9.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/TLrLfkp/energy_anti_stress_loops_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5fd38feb8af3b.pdfIn PDF document text
    • https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/3896959875.pdfIn PDF document text
    • https://gafekiwukuwemul.weebly.com/uploads/1/3/4/3/134313713/navozok.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxevabuvix/eB5hfGq/flashlight_on_my_samsung_phone.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/fibesezati/zezevuxekakojuxepugumeg.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/collision_reporting_centre_toronto_ontario.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/a1000_yaskawa_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/iphone_6_plus_clear_case_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/096c10e7-cae4-4660-b9f5-5025c64acc89/my_name_by_sandra_cisneros_summary.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_off00015627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15627 5584 bytes
SHA-256: 37c0dcc24a654ec37ffdf85fb5cfa98146b6154b2edec7c3726ff707cc3e1ef6
font_01_sfnt_off00016927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16927 11364 bytes
SHA-256: 9ea89fa85f5fda1d6627f7f25deac0d8b15e857da2aa74e15071b655c4941d16

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