Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c7816871a61b67b…

MALICIOUS

PDF

78.4 KB Created: 2020-12-19 11:48:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: fc047e0cec1f881dc4c863acc204e7d7 SHA-1: 9b672aa3341857b7d17ab8af964d9092a7999f3d SHA-256: 2c7816871a61b67b0755a20aac59e23b974645d8241783aaa568b1256262adc7
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with one critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to a 'maintenance technician cv template'. The presence of numerous external links and the ML classifier's high confidence score strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=maintenance+technician+cv+template In PDF document text
    • https://cdn-cms.f-static.net/uploads/4422893/normal_5fa58663c5435.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5f898205b39c0.pdfIn PDF document text
    • https://xitijamovul.weebly.com/uploads/1/3/4/5/134590087/133030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417039/normal_5fc2aef8ae09f.pdfIn PDF document text
    • https://joxenawofin.weebly.com/uploads/1/3/4/3/134342561/5016679.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383704/normal_5fa774beb8d54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426828/normal_5fda8968b370e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5077e6d49a06bb8876c0/1606373497694/tilalame.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/26727771933.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/agenda_setting_and_framing.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/nejajusojekezinozimi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/283c22d1-6e38-43bb-8030-2562dd31cead/kurlantzick_democracy_in_retreat.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/femadaguf.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/phrases_and_clauses_worksheet_with_answers_class_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22f0dcc5-fd87-4420-b1d9-54591d138cb8/2002_nissan_quest_repair_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c3aad26ff1194f72fc70/t/5fc1f4b79b1ed0353821c492/1606546616361/bass_pro_gun_safety_class.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000104d0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x104D0 22892 bytes
SHA-256: 82d399cbf185959297fb7e815ca2cdedd957ac3ed4804fd2670c6fd82ca880f2
font_00_sfnt_off0000d25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25A 4964 bytes
SHA-256: cfa217e0e7c8cbf36307f3903675834cd591be8c653004e4325628ce2cff0282
font_01_sfnt_off0000e32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 9788 bytes
SHA-256: de40b0a62785862dece54cc34426808349e32d9554d62130822827f1c8808a6d

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