Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5473f2534c85474…

MALICIOUS

PDF

70.4 KB Created: 2021-04-30 22:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61f4803108b314c4c5b7d87f33cd4302 SHA-1: 26efa902a05ce30b8162d906bd71ad2aa2c35835 SHA-256: a5473f2534c8547403e648859544c2da28b4e86c2ac75aa57ea68e3b236cc296
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numeric slugs, suggesting a link farm designed to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect the user to a malicious site, potentially leveraging embedded JavaScript for obfuscation or execution.

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://pelibifir.ru/strik?utm_term=whirlpool+microwave+model+wmh31017as-0
    • http://midunetojonawiw.mywebcommunity.org/22956811237.pdf
    • http://ndfnasg.xyz/wagudfjrto.pdf
    • http://3203epworthcres.com/causes_of_neonatal_sepsiswy7ej.pdf
    • https://wusedutewaxugag.weebly.com/uploads/1/3/1/4/131437839/406497.pdf
    • https://cdn.sqhk.co/jekuzedu/b0GlggB/dunkirk_observer_subscription.pdf
    • https://cdn.sqhk.co/womilepeba/1mggjgR/tinkle_definition_english.pdf
    • https://cdn.sqhk.co/xewafazuk/0vhgWOo/gsmarena_pixel_4a_compare.pdf
    • https://cdn.sqhk.co/ganuniwiku/hKxJxhf/train_simulator_2016_free_mod_apk.pdf
    • http://rijigikesezaga.mypressonline.com/94463439112.pdf
    • https://cdn.sqhk.co/muwanije/jf21hjo/wulavosipav.pdf
    • https://lajutiruwogow.weebly.com/uploads/1/3/4/5/134585316/6861506.pdf
    • https://kowijifeno.weebly.com/uploads/1/3/5/3/135390944/kefuzitezagafi-rarumefow-fafup.pdf
    • http://rolopigabetitu.scienceontheweb.net/asynchronous_up_counter.pdf
    • http://getfreecreditreport.info/whats_in_the_book_of_enochvsf1b.pdf
    • http://m-ryanaf.site/sitepagiwamifexirupusebal92.pdf
    • http://wujejejifi.mygamesonline.org/spalding_portable_basketball_system_replacement_parts.pdf
    • https://nafizanoride.weebly.com/uploads/1/3/4/5/134596231/2940470.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zowofiz.myartsonline.com/analyzing_data_with_power_bi_and_power_pivot.pdf
    • https://b4095e1f-5e43-4c35-8b28-ff0c3185c247.filesusr.com/ugd/9cc3de_82bd22f5a2ed45629dde0833b6272c49.pdf?index=true
    • https://e19809cf-df80-48c1-9975-8599b001ad7a.filesusr.com/ugd/062cdf_82f8be03eb0b4a5aa9a68cf81e77bb5b.pdf?index=true
    • http://wemaxoseni.myartsonline.com/basic_chinese_language_learning.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4d9.bin
890e2e987ce7e08291f8286446d34649ed552a0c0aa9ab2885a9cc5d00ab77c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D9 5948 bytes
font_01_sfnt_off0000e91b.bin
ac9a644ea0a74530fbfe31fcf801b94db1155db1b5317b5298c32f5eaf0865ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE91B 10612 bytes

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