Malicious PDF — malware analysis report

Static analysis result for SHA-256 0330b1319c031b03…

MALICIOUS

PDF

74.0 KB Created: 2021-02-26 12:36:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 26d51fea1df779b6ef52b3b3678f59eb SHA-1: cbdebf3250ef351722ffc066570116b7683829e3 SHA-256: 0330b1319c031b032e40656aa67c2a7dc9e2447446f9e2cf4a6dc14bde29c0ff
126 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains multiple external URLs, with one specifically noted as a link farm on disposable hosting, suggesting a phishing or redirection attempt. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate an attempt to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=the+wanderer+above+the+sea+of+fog+description PDF link annotation
    • https://bufetijakuvarit.weebly.com/uploads/1/3/4/8/134878832/7eb7452.pdfIn PDF document text
    • http://dazenad.iblogger.org/metformina_acidosis_lactica_mecanismo.pdfIn PDF document text
    • http://fudoviwil.mywebcommunity.org/jevifidezareverinog.pdfIn PDF document text
    • http://wevoselaxoto.66ghz.com/mn_drivers_license_renewal_time_frame.pdfIn PDF document text
    • http://fishland.store/2808443604754xd3.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/longest_research_paper_ever_written.pdfIn PDF document text
    • https://dodesagetulisuv.weebly.com/uploads/1/3/4/9/134902864/5601cf.pdfIn PDF document text
    • http://natotakujoriw.iblogger.org/3ds_emulator_app_free.pdfIn PDF document text
    • http://leraxedosu.22web.org/business_strategy_frameworks.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sajulugebimisu.myartsonline.com/guvupapegu.pdfIn PDF document text
    • http://fagewoxe.epizy.com/99116454285.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/keto_cookbook.pdfIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/comtrend_ar_5319_turn_on_wifi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F3 5416 bytes
SHA-256: 925adc34823abab019eda7e85d7be94275348aa65cfc4a3d3a54cf05c02994a0
font_01_sfnt_off0000e966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE966 10392 bytes
SHA-256: 226819926fa26474a63509d013d1356714c65fc87d6c755b2c8fce28f5a86347
font_02_sfnt_off00010d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D14 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378