Malicious PDF — malware analysis report

Static analysis result for SHA-256 937cd31c05daf4b8…

MALICIOUS

PDF

72.5 KB Created: 2020-12-31 22:17:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3c98b8d2a13dd552c3b5504b4c5f96c2 SHA-1: e817c28974c89cda7835b911d5435b61223e38d2 SHA-256: 937cd31c05daf4b87e81f184c8152ca391824f80d506f724c4b30500c1ca5ab2
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file identified as malicious by multiple heuristics, including ClamAV and an ML classifier. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The presence of numerous links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/strik?utm_term=the+outbreak+2019+where+to+watch In PDF document text
    • https://static.s123-cdn-static.com/uploads/4501229/normal_5fcba0cd21841.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/8iXyjhr/bufizararodovigusetugina.pdfIn PDF document text
    • https://cdn.sqhk.co/widexerun/dpkjGhb/migodubegesubibav.pdfIn PDF document text
    • https://xixafaxuxux.weebly.com/uploads/1/3/4/3/134340403/6439644.pdfIn PDF document text
    • https://rozinefowo.weebly.com/uploads/1/3/4/5/134576391/sobixitola_vateginitifitix_tajegaxakatatep_zogunalaxijover.pdfIn PDF document text
    • https://cdn.sqhk.co/xaderimi/jjgiZCC/shareit_apk_old_version_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/NfsWyjc/troy_bilt_pressure_washer_pump_parts_diagram.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413842/normal_5feb431d2b639.pdfIn PDF document text
    • https://cdn.sqhk.co/bibilofefi/6gfhiFu/pimesatazobemuvan.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/jinabisura/a._v_aids.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/87255486794.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/lemariwuruzizikarifabime.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/waterfall_model_in_software_project_management.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05b485bb-a5e7-45da-895a-a56f1a8ac5ca/27418519935.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/ancient_cities_game.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_off0000ddc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC5 5404 bytes
SHA-256: 831d18e3c9e16de44fc30dbe10ea3e5ac8a29fb6c82806d8742c8b400a74a233
font_01_sfnt_off0000f038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF038 10376 bytes
SHA-256: e7c78e92b88d2d5aa920f58986a62d7d2027f616453bc11ab3f2f2c58190df9b

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