Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4417be8585e73d1…

MALICIOUS

PDF

68.8 KB Created: 2021-03-03 03:51:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe3b1164e1e30217e1fbe933e0a42073 SHA-1: ae53cde6e1b1d5c709d1e1ffd9b82f3b2da0da0a SHA-256: f4417be8585e73d137a795fbb3dd052e311fc1ff568523960875dc9808b660d2
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spamming operation. One of the primary URLs extracted is 'https://dafemum.ru/123?utm_term=how+to+calculate+perimeter+of+composite+figures', which is likely part of a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://dafemum.ru/123?utm_term=how+to+calculate+perimeter+of+composite+figures
    • https://tebifenan.weebly.com/uploads/1/3/4/6/134675993/polidejojip.pdf
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/jafifaton-fumej-tegagefuruzuj-pegubuwu.pdf
    • https://rajopolaxobi.weebly.com/uploads/1/3/1/4/131406270/691221.pdf
    • http://fuxagiwowasiwu.22web.org/what_does_sociological_imagination_mean_essay.pdf
    • https://cdn.sqhk.co/gidulikegel/wdTcjg2/launcher_apple_tv.pdf
    • https://wokopapun.weebly.com/uploads/1/3/5/3/135388848/dimal.pdf
    • http://tonivatibiri.22web.org/fapemimalu.pdf
    • http://wumijodurixemi.22web.org/87355233025.pdf
    • https://cdn.sqhk.co/gixofusofago/ieNllii/mazda_rx_8_buggy_for_sale.pdf
    • https://zopadujebononi.weebly.com/uploads/1/3/1/3/131380983/wisikuforisidam.pdf
    • http://papotupeti.iblogger.org/fovaxala.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://selifesupenikiv.epizy.com/personification_worksheet_4_answer_key.pdf
    • http://ravesuvanobil.epizy.com/jigglypuff_super_smash_bros_melee_guide.pdf
    • http://xipaxozudagigub.epizy.com/xejakiwevex.pdf
    • http://nolonogatifotop.epizy.com/37563255325.pdf
    • http://saninov.epizy.com/sufewivulevofowafujosi.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_off0000cfb7.bin
647dd8b2cf73b728f3a7f60ea114c3e16430f59ba7c61b5c29fd9548ae409eb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB7 5388 bytes
font_01_sfnt_off0000e20b.bin
f6f488bbd53637a8c12336195ad2cc1d5de1d0792531a921c21475d1a33aa4dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE20B 10376 bytes

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