Malicious PDF — malware analysis report

Static analysis result for SHA-256 5419c253d9e97fd3…

MALICIOUS

PDF

115.5 KB Created: 2021-05-11 00:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 39caf00dccc9c514f598bcdcba98060c SHA-1: ecfad1d7259b8b7db28077f199a05f95e2aa6af3 SHA-256: 5419c253d9e97fd3a09b51262f1715736e9ff6fec5cbdffc987edaec8e2cb1aa
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, indicating a link farm designed for SEO manipulation or to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution vector, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=attack+on+titan+season+3+op+2+lyrics PDF link annotation
    • http://xasowokudat.medianewsonline.com/warixunanevuperudajoguk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374196/normal_603220f9b2ceb.pdfIn PDF document text
    • http://vadanunagirira.getenjoyment.net/search_engine_optimization_seo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494868/normal_603027f1265ba.pdfIn PDF document text
    • https://najatiwexit.weebly.com/uploads/1/3/4/0/134041182/zaxisobimo-zilemamagi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496816/normal_5fd03c4ae3f3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417308/normal_601bc1bf7b2a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487918/normal_6037eb1789754.pdfIn PDF document text
    • http://botarim.22web.org/lexeropufumenokewavigi.pdfIn PDF document text
    • http://tejaxoxedagu.iblogger.org/aletha_solter.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/54927084909.pdfIn PDF document text
    • http://fuxezaboxekave.scienceontheweb.net/57925497076.pdfIn PDF document text
    • https://delovamubikener.weebly.com/uploads/1/3/4/7/134707073/b0ded9ad001541.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gerinaselamezos.rf.gd/34047086130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3faa2740-62ea-4c47-8050-c73eda9dc391/why_samsung_tv_remote_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d7629ff-d620-43c8-9d80-d0874b8a3b4e/zawerojadedisojegegujali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca92f72a-e1a7-405a-8cee-2de17b0b7a1d/90580216139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1440ee10-b909-40ed-83cb-9468df78e874/metosenalugumunopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a810ff3a-fbb4-489d-b131-894039973825/doxusufirixeko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/381187ab-5064-4834-be21-a8cf37fa901d/73666881027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b63a4bc-5309-453d-a9f0-1e0b0c11e914/the_science_of_mind_audiobook_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7462552e-2886-4d49-96c0-93f9af2dfcc3/pojavegagoral.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73E 47828 bytes
SHA-256: 933616e67f23732d397eeb7447d0861f4c059fb81d84d105c3be382bea8a63a0
font_01_sfnt_off000188e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188E3 5380 bytes
SHA-256: 3f6edb2a156471ec729b936011ae0b5da22feb4caa7bb7a4fdbbb40a59492f33
font_02_sfnt_off00019b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B4C 11300 bytes
SHA-256: 88514805a0eeebac3f99f803808d20c02146f7f947e6209a59f17226ecec4235