Malicious PDF — malware analysis report

Static analysis result for SHA-256 a746a1d1df812b6b…

MALICIOUS

PDF

90.1 KB Created: 2020-11-17 23:57:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f0cffa6811b8cbcbb0eeb529c52b38f SHA-1: 557d0b6d75cb833db747ebd40b164fd7ef7a466b SHA-256: a746a1d1df812b6b6f975d5321c15672340935a35f1b25419a4059584e769399
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to potentially malicious domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a title that might be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/123?utm_term=katsute+kami+datta+kemono-tachi+e+rating
    • https://kogemujifogez.weebly.com/uploads/1/3/4/3/134344524/jarovaso.pdf
    • https://rajivuwos.weebly.com/uploads/1/3/4/3/134398668/8d84947fd52fb17.pdf
    • https://cdn-cms.f-static.net/uploads/4369657/normal_5f882a785d82d.pdf
    • https://pasuzexogisinib.weebly.com/uploads/1/3/4/2/134266431/9838498.pdf
    • https://solubowobadiwu.weebly.com/uploads/1/3/4/6/134642134/nisujipoteg-lirenaxiwanini-mifora-tifurenapo.pdf
    • https://ramipataxeki.weebly.com/uploads/1/3/4/4/134483057/6509543.pdf
    • https://cdn-cms.f-static.net/uploads/4368471/normal_5fadd880b4add.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/44fd2e47-6fb8-40d7-b72c-b37dab85b80c/bfs_and_dfs_time_complexity.pdf
    • https://uploads.strikinglycdn.com/files/7ffcc6b9-5afa-4cd4-bb2e-519e7a61d6bf/65153193403.pdf
    • https://uploads.strikinglycdn.com/files/3b39642f-3ea2-448c-8ac5-7dd099775066/72118873216.pdf
    • https://uploads.strikinglycdn.com/files/fb31a61c-a40e-4bf2-9ab2-cd88731ff266/97434001596.pdf
    • https://uploads.strikinglycdn.com/files/d0aa95a6-9082-4fb9-bc17-a52790195a59/gejefudomelubuvepubirimu.pdf
    • https://uploads.strikinglycdn.com/files/40f0553a-2761-4051-bb62-6b7fa00b0464/binder_clip_catapult.pdf
    • https://uploads.strikinglycdn.com/files/6c0171ba-29b1-41ed-a882-d404112892b3/ruzagukal.pdf
    • https://uploads.strikinglycdn.com/files/26ab1cf2-8372-416c-ab7a-86a178808fef/3_quarks_daily_wikipedia.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010607.bin
3d25022bfb5c6ea9946265cb722731d36f8d713c14af05c3072f799b537a5daf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10607 7616 bytes
font_01_sfnt_off00011f05.bin
55eb3a9b3f7cc8f6e483646c49ff09e26a8cb384a3d0c87de49c31d0aa6338d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F05 5388 bytes
font_02_sfnt_off0001312f.bin
1cb7ba2391548574aa4174401d46f04c1ecd8de7109d37a248a132b32a2934d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1312F 12072 bytes

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