Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f16d681d398c2d…

MALICIOUS

PDF

78.5 KB Created: 2021-02-27 05:49:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f1614f87479bcde3d74c0c58519445d9 SHA-1: 31d37843745f4164ffc5aedcb8f2bc702e5d26c2 SHA-256: d3f16d681d398c2da0f1fc9cd59366fd90fba53d44467b2f487ede6d14899658
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, and contains a critical heuristic indicating it's a redirector link. The document body, though heavily obfuscated, appears to contain keywords related to 'hacks', suggesting a lure. The presence of numerous embedded URLs, including a link farm, strongly indicates an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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://yafferge.ru/wix?keyword=combat+arms+vip+hacks+2020 In PDF document text
    • https://cdn.sqhk.co/nokotadi/iVjichh/77119275725.pdfIn PDF document text
    • https://cdn.sqhk.co/remowiwa/g5j7ijc/bilolutedejopa.pdfIn PDF document text
    • http://potenciy.xyz/nakinoiq35j.pdfIn PDF document text
    • https://cdn.sqhk.co/tezasevimab/iha8Cid/63978622877.pdfIn PDF document text
    • https://buwefube.weebly.com/uploads/1/3/0/9/130969915/4977794.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/vegilek-zatul-govubeliroguzeb.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/hf07jj5/stickman_fight_free_online.pdfIn PDF document text
    • https://gavedomosuzutu.weebly.com/uploads/1/3/4/2/134234743/gutofoxusenelifek.pdfIn PDF document text
    • https://cdn.sqhk.co/minofavazu/giH0iij/56987214260.pdfIn PDF document text
    • https://tadizape.weebly.com/uploads/1/3/1/6/131637484/fiwopudivosejavaligi.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/xifabilejilab/26476633955.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/waduja.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/luwudonefa.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/fikovugelivesegibe.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/40848702121.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE128 5584 bytes
SHA-256: d990a4f6e9ec803c0e51b07d58630fd2546aae0c20ddb95b70e0e7d344a42073
font_01_sfnt_off0000f3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F7 10232 bytes
SHA-256: de14c623006b90882c5c3d2f95b6de21fe7da029e957727817ff3e8d8055fba0
font_02_sfnt_off00011742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11742 16148 bytes
SHA-256: dbe1f6873dfbc63a557840fa26764ed1e24daf10180a919a5f50e881975b6f06

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