Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd49d1ca211c385a…

MALICIOUS

PDF

66.0 KB Created: 2021-03-28 21:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 797bf788263123349dd68fdcfe1e2bd6 SHA-1: 305de967001e80f2094304c57c07c51c36158844 SHA-256: dd49d1ca211c385aceacedb74d9ef3d0b21b0c1ac0235b26c1564ac8ae1ade58
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 embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/strik?utm_term=newton%2527s+laws+of+motion+examples+slideshare
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/jinozixatonofe-vubunetefowef-pemilizel.pdf
    • https://rumikupim.weebly.com/uploads/1/3/5/3/135310872/vowasavujami_sutudanifadir_rikipaduroli.pdf
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/nasajuwekigoko.pdf
    • https://static.s123-cdn-static.com/uploads/4409405/normal_60020b857a671.pdf
    • https://cdn-cms.f-static.net/uploads/4476127/normal_6028aabb13488.pdf
    • http://suvexavez.iblogger.org/ludezefolosuxidajeti.pdf
    • https://static.s123-cdn-static.com/uploads/4452621/normal_5ff2c520bf3b6.pdf
    • http://ferebamof.22web.org/destiny_2_forsaken_black_armory_guide.pdf
    • http://xezupotivevilib.22web.org/filmorago_mod_apk_unlocked.pdf
    • https://robidolaw.weebly.com/uploads/1/3/0/7/130776002/pesugos.pdf
    • http://juzajikadig.22web.org/bypass_survey_to_file_online.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zeduxekuvuwexu.epizy.com/21160418470.pdf
    • http://narakeke.rf.gd/weight_watchers_scales_ww125a_instruction_manual.pdf
    • http://zoluwupaxefiv.rf.gd/89517786778.pdf
    • http://fusupufe.epizy.com/legavudetegadetape.pdf
    • https://s3.amazonaws.com/rolefosiju/divinity_original_sin_2_summoner_build_guide.pdf
    • https://s3.amazonaws.com/garorowa/lifupabewet.pdf
    • http://zidotafezanu.epizy.com/35936928382.pdf
    • http://jawuguv.epizy.com/78906727849.pdf
    • https://s3.amazonaws.com/feliso/15607328618.pdf
    • http://kovewufawik.rf.gd/arabic_letters_beginning_middle_end_worksheet.pdf
    • http://bevupun.epizy.com/31537270970.pdf
    • http://fifozeripomok.rf.gd/95513501351.pdf
    • http://fukijudetoj.epizy.com/faxawudo.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_off0000c8f2.bin
2a42069b6e0f799196945c57e2bc22b1345e899f1744a96a34f227b1e3f876c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F2 5444 bytes
font_01_sfnt_off0000db6e.bin
93913fb99585b45f80464314353ca02055c33a21e23f4529cd5b533e635f1b18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6E 9060 bytes

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