Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f5c9aa70f67aa6…

MALICIOUS

PDF

83.7 KB Created: 2021-03-28 01:31:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 0667dc892834068038c655f2ed1ef421 SHA-1: 93e77efeb53c4695e163e411fa82619ceb7ce353 SHA-256: 88f5c9aa70f67aa6a88067592f3ea17e509409c082acca563afbd8aa6d10610d
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting it functions as a link farm or redirector. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a deliberate attempt to obscure the final destination and potentially lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://resalured.ru/wix?keyword=ffxiv+chicken+breast PDF link annotation
    • http://perfectiona.online/79999730731y3py4.pdfIn PDF document text
    • http://fegiroxopirez.sportsontheweb.net/what_banks_are_involved_in_the_letter_of_credit_process.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/20497063345.pdfIn PDF document text
    • http://mutuvukawawe.22web.org/masamunixomebakod.pdfIn PDF document text
    • http://umdtheatre.ru/who_died_in_13_reasons_why_all_seasonsdij11.pdfIn PDF document text
    • http://tojasojula.iblogger.org/quick_heal_antivirus_free_for_mobile.pdfIn PDF document text
    • http://makamar.tech/35744462006yzmeb.pdfIn PDF document text
    • http://vifezitenof.getenjoyment.net/vidafepimibafubasi.pdfIn PDF document text
    • http://kokulotasuz.mygamesonline.org/79012905407.pdfIn PDF document text
    • http://jopkapopka.online/what_is_the_poem_song_of_myself_mostly_aboutp2q1a.pdfIn PDF document text
    • http://soldonlakewood.com/14302781276mhhiz.pdfIn PDF document text
    • http://sexesex.site/rc_gyrocopter_kit2eq4p.pdfIn PDF document text
    • http://scrlt.xyz/m-audio_fast_track_pro_usb_drivers_windows_7iy38t.pdfIn PDF document text
    • http://opit.space/kifatub4szw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0f424234-9c27-4462-a606-4b2ccecf17d8.filesusr.com/ugd/b42a09_03366f0d46324858aaa60d1b20c1772d.pdf?index=trueIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_e27f809c39264e90bc2be536a4767843.pdf?index=trueIn PDF document text
    • http://vozuxekeve.rf.gd/jepinebebotupif.pdfIn PDF document text
    • http://jupagezasolax.rf.gd/gavanujapoxe.pdfIn PDF document text
    • http://jeromixowo.epizy.com/angularjs_viewer.pdfIn PDF document text
    • http://lizuruvabeg.epizy.com/99193152109.pdfIn PDF document text
    • http://zuzaxitiruxojax.epizy.com/xfinity_xr2_remote_not_working_with_sony_tv.pdfIn PDF document text
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_96ceea5298f94d9597adf3de1c2ddf5f.pdf?index=trueIn 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_off00010930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10930 5224 bytes
SHA-256: 6095d19e8f8bcd8ad2d3f25188b23c543accf0756e70fa598135e51e6a0b1543
font_01_sfnt_off00011afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFC 11000 bytes
SHA-256: 700c0cc02c554aad366354bd212f7fb00e517dfb9e4d3595b92581b48ee5f24e

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