Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9bb5c66599a3dd7…

MALICIOUS

PDF

84.3 KB Created: 2021-04-05 18:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0ec332384fa4f5b73388a30c974d4ceb SHA-1: 5d71c509ee02912da65bc24c1bf8bacdafa75eec SHA-256: e9bb5c66599a3dd771232a69dffb929bc278449596d22101ac0ef984584e4776
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URLs, some pointing to disposable hosting and acting as link farms, suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', indicating its generation method, and the URL 'https://bologen.ru/wix?keyword=surah+e+yaseen' is a primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/wix?keyword=surah+e+yaseen PDF link annotation
    • http://uablog.website/how_to_start_porter_cable_air_compressori51zx.pdfIn PDF document text
    • https://nolulanulupu.weebly.com/uploads/1/3/1/3/131379612/32010a4747.pdfIn PDF document text
    • https://zufodivovogopot.weebly.com/uploads/1/3/1/3/131383523/xuvami.pdfIn PDF document text
    • http://100naturals.fun/bivepilet4u6p.pdfIn PDF document text
    • http://latencfsrt.space/jisilivejuxoluborg1onx.pdfIn PDF document text
    • https://rititebavoxufi.weebly.com/uploads/1/3/4/7/134705535/7549693.pdfIn PDF document text
    • https://jexafowasefuxuv.weebly.com/uploads/1/3/4/5/134588667/1827647.pdfIn PDF document text
    • https://xibixijuli.weebly.com/uploads/1/3/5/3/135399677/depajapiz.pdfIn PDF document text
    • http://sekodosara.22web.org/superannuation_standard_choice_form.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_3f143adaa37440fe919ceedbf940ac49.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6d607e7-b5b8-401a-847e-293013b85b9b/could_thrawn_be_in_the_mandalorian.pdfIn PDF document text
    • http://wofekasirirak.rf.gd/nazekagarufoxemogexa.pdfIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_4d23e59c7ae145198999804390ba5430.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/776642e7-846e-4a56-9abf-a8968778babb/84982979739.pdfIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_a903afb773324a55a59c60ea4ffcea49.pdf?index=trueIn PDF document text
    • http://kasinolexol.rf.gd/beginners_guide_to_search_engine_optimization.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84138dae-b43c-4f68-ac85-ffaee10c474d/tilaj.pdfIn PDF document text
    • http://balifajaxi.epizy.com/adaptation_and_mitigation_strategies_for_climate_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8c393c6-500b-4427-8714-32193737f759/christmas_carol_book_online.pdfIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_315f9c418b4b46c38ea4fc0b25b6709c.pdf?index=trueIn PDF document text
    • http://zasufogokalo.rf.gd/53943184127.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 4944 bytes
SHA-256: 892d619b73357eb99ed9cb1b6d194604df53d21a97c836a2a821c17e6669fd9a
font_01_sfnt_off000106a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A8 11908 bytes
SHA-256: 6a7b9c60667891dbac835d92d39ecbcf1bc679cbebe4ebda4e1b182e7ac43db6
font_02_sfnt_off00012e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E64 16440 bytes
SHA-256: 818d2afa3c3f813f5f5a602a298931418602f362e9c38d8f3fe9a2b1455a376b