Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41f5b4933345e5c…

MALICIOUS

PDF

71.0 KB Created: 2020-11-29 21:38:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 3d81d1e269955b642ae9722204d988b6 SHA-1: 7a9b47c3bee73f659e581b0fa95cf497a7a1ab4a SHA-256: f41f5b4933345e5cf01fd5837ef3558324ee1996a92d14045da4063db5cade53
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting services and are part of a link farm. One URL is specifically identified as a redirector to known malicious infrastructure. The ClamAV detection and ML classifier further support its malicious nature, indicating a phishing or trojan distribution attempt.

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
  • 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://traffking.ru/aws?utm_term=aircraft+incident+and+accident+reports In PDF document text
    • https://vakufijasulu.weebly.com/uploads/1/3/4/5/134592391/880384.pdfIn PDF document text
    • https://bupuxikamofimap.weebly.com/uploads/1/3/4/7/134734142/wazizobininesis.pdfIn PDF document text
    • https://zebewanuvaxa.weebly.com/uploads/1/3/4/6/134613040/lolifikajilezoda.pdfIn PDF document text
    • https://bolomomotune.weebly.com/uploads/1/3/4/7/134762543/rusivefejap-videpuma-taxokox-pasorovudatuf.pdfIn PDF document text
    • https://furutivox.weebly.com/uploads/1/3/4/3/134360368/967218.pdfIn PDF document text
    • https://dagigofeno.weebly.com/uploads/1/3/4/8/134887245/8c3633f93ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5fa0e119651be.pdfIn PDF document text
    • https://lozugukavokukes.weebly.com/uploads/1/3/4/3/134357100/kuvenorek_pizilixuwix_jisane_bojomatulagenam.pdfIn PDF document text
    • https://visuzajekug.weebly.com/uploads/1/3/4/3/134305902/sabofisevinenev_mixenukim_tiwowagi_waxezo.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/robumuduluwise/lockridge_lumber_and_hardware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73f1d57a-f3fc-450e-8c68-fe6795a8c09b/echols_corn_popper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6acae5a-b039-4117-9142-197724146589/singer_knitting_machine_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2f5af2e-9f84-47c9-9bee-b0cd124f0991/independent_and_dependent_probability_worksheet_with_answer_key.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_off0000ccb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB4 4892 bytes
SHA-256: 22f14b58b0498ca41330f4173e587f8a32e0192512e461cfabb475f59efc37ca
font_01_sfnt_off0000dd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4F 10392 bytes
SHA-256: ee4f6b08e5593ae6b8a60a4e9ecbbf4c9072e2ff0b026a879adda227bb505529
font_02_sfnt_off000100b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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