Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc53a8b2f09e7d1…

MALICIOUS

PDF

75.5 KB Created: 2021-03-17 00:16:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8fcc8f00dbc04b9a5e9b251cbe4d94fc SHA-1: eb0dec9f15193e896fb713e7bbfe142b99f7e622 SHA-256: 1dc53a8b2f09e7d103208dc65ffae9edc77017329497041df9d814888d873864
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary URL 'https://ponafet.ru/strik?utm_term=cuanto+mide+el+metro' suggests a potential phishing or spamming campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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-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://ponafet.ru/strik?utm_term=cuanto+mide+el+metro
    • https://dinozijumuf.weebly.com/uploads/1/3/4/3/134315767/rujesaxobajuvun.pdf
    • https://static.s123-cdn-static.com/uploads/4499329/normal_600922c3f2afb.pdf
    • https://cdn-cms.f-static.net/uploads/4421333/normal_60400974170c9.pdf
    • http://zabavnyi-slon.ru/88940275321dvqey.pdf
    • http://top-salez.site/dialectical_behavior_therapy_memphis5eybi.pdf
    • https://loxerujose.weebly.com/uploads/1/3/0/7/130775489/4761751.pdf
    • https://fogakorix.weebly.com/uploads/1/3/3/9/133997140/f591459c9d.pdf
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/d58cf72b.pdf
    • https://tadinitalu.weebly.com/uploads/1/3/4/7/134744808/ed84bad.pdf
    • https://cdn-cms.f-static.net/uploads/4383322/normal_600dc53d0a74e.pdf
    • https://sazalilo.weebly.com/uploads/1/3/4/5/134592982/dipatovum_lixodo_zobikaduwa_navanevi.pdf
    • http://giocodigital.fun/nobariwuximaganikikuxedebr9fyx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/57a91f55-b172-48b1-ba1f-b66b3f87fa39/71549769572.pdf
    • https://uploads.strikinglycdn.com/files/7f05d998-7177-4463-b351-acda2500c6e8/detoli.pdf
    • https://uploads.strikinglycdn.com/files/11224e14-afb9-4842-9920-685829494df3/36620455185.pdf
    • https://uploads.strikinglycdn.com/files/3902c9e2-0387-4b3a-91af-588a8412e015/i_cant_afford_losing_you_meaning.pdf
    • https://uploads.strikinglycdn.com/files/be716a9f-4453-4e1c-b11c-d7377f7280ae/12671732550.pdf
    • https://uploads.strikinglycdn.com/files/9bc99821-ecae-4aba-aaa3-724658a0afd8/how_to_do_a_love_tarot_reading_for_yourself.pdf
    • https://uploads.strikinglycdn.com/files/cede61db-b9ec-4a8c-ad14-ea3d57f0cb89/what_happens_if_i_overeat_for_2_days.pdf
    • https://uploads.strikinglycdn.com/files/4a17e682-587f-4dac-b3de-d34a06174811/9621757463.pdf
    • https://uploads.strikinglycdn.com/files/3b9bb777-99db-40d4-9003-1834f0077673/illinois_real_estate_broker_license_requirements.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_off0000e936.bin
b5fd4b969275d3f08c9e50bc6eb656cfeba3a5a8ac1a1f018fa5465df7bc1442		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE936 4700 bytes
font_01_sfnt_off0000f911.bin
0ebdbacbdc4eff43f1e5ebcd794e8b1a1a3377fa2efae0a38de17941d8031410		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF911 11808 bytes

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