Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8dd2db0bbcfa6b5…

MALICIOUS

PDF

86.4 KB Created: 2021-05-04 01:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1beacece275eaf18494622cc9d7900d SHA-1: 5a05ce69fceb1d4a6b70a0bc0d4f1886111c4901 SHA-256: a8dd2db0bbcfa6b5f2d2ba9db88d45d36d638d8178444abd0d5cff97c4942cc5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with a primary malicious URL being `https://resalured.ru/strik?utm_term=224+valkyrie+load+data+h4350`. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the link farm structure strongly suggest 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

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://resalured.ru/strik?utm_term=224+valkyrie+load+data+h4350
    • https://cdn-cms.f-static.net/uploads/4501501/normal_6021715bd5479.pdf
    • https://cdn-cms.f-static.net/uploads/4407331/normal_604413473d85d.pdf
    • https://cdn-cms.f-static.net/uploads/4415322/normal_5fdc0cf72dd1d.pdf
    • https://lufuneliza.weebly.com/uploads/1/3/2/6/132682735/3350873.pdf
    • https://gelatotagubas.weebly.com/uploads/1/3/0/8/130813077/zeneviwegajizut-wavaxodi.pdf
    • https://static.s123-cdn-static.com/uploads/4417998/normal_6008c0b86cd40.pdf
    • https://cdn-cms.f-static.net/uploads/4368977/normal_601563cdc2845.pdf
    • https://jigurojo.weebly.com/uploads/1/3/5/3/135321607/9206488.pdf
    • https://cdn-cms.f-static.net/uploads/4473379/normal_603bb19838c87.pdf
    • http://item-mask.top/wazaliwutovilurituvl1m80.pdf
    • https://zadidiboz.weebly.com/uploads/1/3/5/2/135295834/5251263.pdf
    • https://tiwapopo.weebly.com/uploads/1/3/0/7/130739059/a0a38daed2b.pdf
    • http://com-servers.online/vegipevijaxokegonagcusqe.pdf
    • https://cdn-cms.f-static.net/uploads/4481067/normal_5fd329604aa45.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5057b38b-f250-4925-a5fd-2dbc054a2c1f.filesusr.com/ugd/25ee37_1632f287a6de4eee8224dfd8b3a6bee9.pdf?index=true
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_8fd495bccd82408da17368997a458446.pdf?index=true
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_962573655bb448528e0232e7a3a5b2db.pdf?index=true
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_1f6cdd4972b34f03955b8a6229cf9dbc.pdf?index=true
    • https://ba739632-11db-41f7-a023-683a20e55d36.filesusr.com/ugd/99835b_6eaf33f55dc047c2a98b20ae34840059.pdf?index=true
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001313e.bin
87ef0708d753e1d01faefb897715702545fc89f7aacf8723e6e55c16d85c2067		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1313E 17300 bytes
font_00_sfnt_off0000f2d9.bin
7d60f623a0e210e9ece16f73be0d5118119cc9874cf96cf2022bcb69ba321e34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 5516 bytes
font_01_sfnt_off000105a2.bin
c0aaca9ccc701a2fe336ad13b4d7b14b59bff132bab42979d68b71f169c2c749		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105A2 12908 bytes

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