Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53893da8b3f6c36…

MALICIOUS

PDF

75.6 KB Created: 2021-03-19 10:42:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bcd5a205f8caf6c7f321547379623ccc SHA-1: a18c00587b0f62273e40f65942d4c3ee000ffd89 SHA-256: a53893da8b3f6c367fed6c071d4b27cb9837f162ab89b6ba4b1fa4a32c1ea3c4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with a prominent one pointing to 'pelibifir.ru', suggesting a redirection or download attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent to distribute or phish. No scripts were extracted, but the overall structure and external links point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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 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://pelibifir.ru/award?keyword=ableton+live+9+manuale+italiano+pdf PDF link annotation
    • https://muwegegedagus.weebly.com/uploads/1/3/0/7/130738526/6317781.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494891/normal_6035935f6e102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478134/normal_600e646bcc54f.pdfIn PDF document text
    • http://ziwotixog.22web.org/cutting_edge_pre_intermediate_vocabulary_book.pdfIn PDF document text
    • https://cdn.sqhk.co/xawemubimaj/idgghdr/86818807221.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwilaj/Vpgi6gg/i_wish_quotes_about_friends.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500911/normal_6030cd33c1412.pdfIn PDF document text
    • https://fozabezadako.weebly.com/uploads/1/3/4/6/134639332/mikatebubuvoza.pdfIn PDF document text
    • https://rinuvigilositu.weebly.com/uploads/1/3/4/4/134463450/9886606.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475212/normal_600290ebdade2.pdfIn PDF document text
    • http://hugertely.xyz/how_to_develop_website_using_wordpressfzn1y.pdfIn PDF document text
    • http://appletopshop.ru/windows_10_forensics_cheat_sheeta8r3x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479214/normal_5fc7b909abe24.pdfIn PDF document text
    • https://cdn.sqhk.co/bugolajoxodu/bs0hhKb/jesejidepaxumatuwakot.pdfIn PDF document text
    • https://kobuzonoge.weebly.com/uploads/1/3/1/4/131452837/8327463.pdfIn PDF document text
    • http://dvigatel.guru/what_to_the_american_slave_is_your_4th_of_july_purposefixjy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rozipiliwune.epizy.com/pneumatic_system_in_aircraft.pdfIn PDF document text
    • http://vomifavub.epizy.com/winter_colouring_sheets_for_kindergarten.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CC 5256 bytes
SHA-256: a3960e1624afb8859968c3cb31cadc789d099fb92eef3305d78c7dc7247e8969
font_01_sfnt_off0000faa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA2 11824 bytes
SHA-256: d39c438bb52bc0fb04c1a627eae313c5518856059b3a51db8f3edf215dbce32a

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