Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c1ac85c81f94bb…

MALICIOUS

PDF

82.6 KB Created: 2020-11-19 22:41:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5db548999f31fd15d8d4b987b8935014 SHA-1: 9df4a4bc2e2b17e97820f74127a12b2403d42bac SHA-256: 71c1ac85c81f94bb7eeecab23372f0fd7bb9cb225f7c3e4c4d1ec0582cfd294b
244 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with multiple heuristics indicating it functions as a link farm. One critical heuristic specifically flagged a link to a known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, but the presence of numerous links to potentially malicious sites suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gettraff.ru/strik?utm_term=celluloid+heroes+sheet+music In PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/475594.pdfIn PDF document text
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/3544528.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/velat_zilajamuvabetep.pdfIn PDF document text
    • https://rewuxumo.weebly.com/uploads/1/3/4/5/134586949/mosaxujekiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5f87613154423.pdfIn PDF document text
    • https://fuduxudeki.weebly.com/uploads/1/3/4/6/134606049/vuremoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382412/normal_5f9f590c78a1a.pdfIn PDF document text
    • https://dabituge.weebly.com/uploads/1/3/4/3/134344098/945974.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/2ce6b3c3-1486-4ef2-815d-307ad50ce4c2/37252462483.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9af4a10-401b-4d38-932e-d418692d246b/casio_wave_ceptor_3140_atomic_watch_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/transformers_prime_all_decepticons.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_off0000e314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE314 4768 bytes
SHA-256: dcd6dcfeb5ae2985ce548f0d1d00291ec55ebaeb35ebdc18eb03ec3b8627bbac
font_01_sfnt_off0000f348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF348 11652 bytes
SHA-256: 4abc072315526875426078a7a37b336fe937acfd43daf60c323b3d9f459a35f2
font_02_sfnt_off000119ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EC 16100 bytes
SHA-256: d973db94ba2c448c661c26f08d051ac794e7cb4f3c7daa33c2141e8036f071b6
font_03_sfnt_off00012eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBA 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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