Malicious PDF — malware analysis report

Static analysis result for SHA-256 d654c2f61a7ed46c…

MALICIOUS

PDF

79.9 KB Created: 2021-03-25 11:50:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9a31153e0e7958d8562769f962b077c SHA-1: 20f69c02246b10133cdb275eea55d8c50ab7cb91 SHA-256: d654c2f61a7ed46cc393fb0b4eafdd295ad9e8d3b3e4c0fc8c11bb89311fda07
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which are associated with link farms and SEO manipulation tactics. ClamAV and ML classifiers have identified it as malicious, specifically a phishing trojan. The presence of multiple suspicious domains and the PDF_SEO_LINK_FARM heuristic strongly suggest a malicious intent to redirect users to potentially harmful content.

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://maypoin.ru/award?keyword=energias+renovables+ecuador+pdf
    • http://zathkatow.xyz/vudulosaseresovumaxojbfi4.pdf
    • https://cdn.sqhk.co/gupuwiwi/RNihrji/triblive_football_broadcast.pdf
    • http://titoto.xyz/matemticas_avanzadas_para_ingeniera_oneil4q2s3.pdf
    • https://vapovudinawixe.weebly.com/uploads/1/3/1/4/131437980/lesezivurukemum_xubasuvad_zusotoxalepov_xazuwidodi.pdf
    • http://tameenegypt.com/powerpoint_templates_free_technology0610c.pdf
    • http://kefets.xyz/how_can_eminem_rap_fast94yyx.pdf
    • http://hookup154.site/bioecological_theoryawgx1.pdf
    • https://napujokid.weebly.com/uploads/1/3/5/3/135339673/7386909c76c.pdf
    • http://remastacer.com/what_are_the_sum_of_the_interior_angles_of_a_polygon44zts.pdf
    • https://mopuvavipobum.weebly.com/uploads/1/3/1/0/131070525/6676fc2.pdf
    • https://vijapuloxo.weebly.com/uploads/1/3/0/7/130775263/8350741.pdf
    • https://cdn.sqhk.co/surikuzezun/Jhdhgih/fitbit_charge_2_won_t_sync.pdf
    • https://cdn.sqhk.co/pikikunifav/cIhdC8Q/58552115748.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9fc80a0e-b25b-4135-afeb-9811a1ea6bf8.filesusr.com/ugd/91e123_6cf7837c6f1a4f2b8b2347f0795dafad.pdf?index=true
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_ee6795c8130d44d3b416f89d2239ccc8.pdf?index=true
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_4bae9815d6eb4db98c648adc204a24d0.pdf?index=true
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_b60fe5193e1243eb84c6d11d0c4765b5.pdf?index=true
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_71da48648325497eb027e24765d63009.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9b5.bin
1d49a77d365e036f293c7a1c4af7356a8d7e07c2878b0f73b5d027ea5f7bcd31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B5 5480 bytes
font_01_sfnt_off0000fc67.bin
38c7e6948b39c5d653e568fa1e960e911959aa11e28b372c0d675fdbb182dced		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC67 2412 bytes
font_02_sfnt_off00010710.bin
1f9d534a038f800d0a51eb5001446bf27d2b52625e38c1d16b16e641abc9b050		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10710 12876 bytes

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