Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2dcfc3da241bec3…

MALICIOUS

PDF

66.2 KB Created: 2020-11-23 01:46:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6cd51dcd0bd4e5955cbfb5ae6af1615b SHA-1: 90cf947eb2c3a8ff56260a693e14d8314e128c0b SHA-256: d2dcfc3da241bec362a20e110f9e89a8dcaf01a173320b6a18d5305c6ed8c9b3
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV also flagged this file as malicious. The presence of numerous external links suggests an attempt to direct users to potentially harmful content or phishing sites, consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/123?utm_term=spoken+english+pdf+bangla
    • https://cdn-cms.f-static.net/uploads/4368478/normal_5fa481b01f69e.pdf
    • https://cdn-cms.f-static.net/uploads/4389361/normal_5f9ac80b53bec.pdf
    • https://cdn-cms.f-static.net/uploads/4369511/normal_5f9a09d6e9dad.pdf
    • https://tapinizeguzuj.weebly.com/uploads/1/3/4/4/134456840/rusuxotoxi_sepuniworanemul.pdf
    • https://deximuxinudob.weebly.com/uploads/1/3/0/7/130739142/nibituje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pegek/jufagijasijaxedife.pdf
    • https://s3.amazonaws.com/pafexegud/avg_pc_tuneup_2019_crack.pdf
    • https://s3.amazonaws.com/vokeri/lucina_smash_ultimate_guide.pdf
    • https://s3.amazonaws.com/xovekolamoxe/eoc_study_guide_biology_answers.pdf
    • https://uploads.strikinglycdn.com/files/f47387fb-9d7f-4958-85b2-44e5a1c5b63b/christ_cornerstone_scripture.pdf
    • https://s3.amazonaws.com/takateg/86419893717.pdf
    • https://s3.amazonaws.com/rotafasaniz/the_roads_of_the_roman_empire_answer_key.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2d0.bin
2da8c84644dc5d0952b8041b9f91a82af4bb927c18c739f3290ab0f10eb841f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D0 5516 bytes
font_01_sfnt_off0000c58a.bin
60fc4fefbb2b0de20ce8a655d5acc6e06bcf32cab8f80dabc963a80b7847e669		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC58A 9880 bytes
font_02_sfnt_off0000e6ab.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AB 16204 bytes

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