Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5e7bfdd572bb6e…

MALICIOUS

PDF

75.6 KB Created: 2021-03-29 21:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a7b8ed48a312dee2bff43c6cc857c286 SHA-1: b5a77a18165dff15d4e162bb7b91ac240cb8317f SHA-256: cd5e7bfdd572bb6e34397ab881ef27e594da2ecb0d172f6ddce1f4554bfe66ab
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 for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable domains and link farms, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', indicating its generation method, and a specific URL related to 'honda shadow 1100 battery replacement' which is likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=honda+shadow+1100+battery+replacement PDF link annotation
    • http://xubaseki.iblogger.org/24927615643.pdfIn PDF document text
    • https://lupenasax.weebly.com/uploads/1/3/4/7/134738003/jubiwupem.pdfIn PDF document text
    • https://cdn.sqhk.co/lexebogefaj/hghiDDr/blackmail_odia_film_full_song.pdfIn PDF document text
    • http://kulokozataxat.22web.org/vurelosubup.pdfIn PDF document text
    • http://daxasukivebo.22web.org/zenuxasidekolamasekuki.pdfIn PDF document text
    • http://ketorebagibof.22web.org/ambiguous_pronoun_reference.pdfIn PDF document text
    • http://numberoone.xyz/what_is_the_difference_between_zeus_and_athena67jet.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/jathiji/tigesavezodavawazezodoju.pdfIn PDF document text
    • http://axecheat7.xyz/846671852274mpv3.pdfIn PDF document text
    • https://cdn.sqhk.co/tovitaxani/c8giyzj/84683444475.pdfIn PDF document text
    • https://wajiwojoduposop.weebly.com/uploads/1/3/1/3/131379590/mopus-noxonijifog.pdfIn PDF document text
    • http://zifirarukax.22web.org/66092555753.pdfIn PDF document text
    • http://zobavomafiv.iblogger.org/returofalilopitakiko.pdfIn PDF document text
    • http://bonenipani.22web.org/accutron_218_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dafitigare.epizy.com/83764800795.pdfIn PDF document text
    • http://rixedefi.rf.gd/rogalekul.pdfIn PDF document text
    • http://mutodilevo.epizy.com/ariston_washing_machine_manual_av61.pdfIn PDF document text
    • http://fuwuwiri.rf.gd/22786384588.pdfIn PDF document text
    • http://bigobawavelig.epizy.com/fadekufunanupumokovin.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_off0000e991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 5804 bytes
SHA-256: 088618e6874624fa518a7755aa49e5fcb6c8811b7e4e3766fe3801ee61414f17
font_01_sfnt_off0000fd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD38 10452 bytes
SHA-256: f0a0ce118c113ae1fc9d433b51fc420556e9f4602d8b30b358e7579d574c35a3

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