Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e827fa5f4598d3…

MALICIOUS

PDF

66.2 KB Created: 2021-02-21 20:31:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3ddbd3c61e1c21937204dfc5aece6e2c SHA-1: 2e7c03e6ae232c84084104f653fbced50bed7bf6 SHA-256: 84e827fa5f4598d35e95a20a66ca255d1e7b2225e8d33bc41fb2572eeab1f072
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, with one prominent URL pointing to a suspicious domain ('druttle.ru') that appears to be part of a link farm. The presence of multiple distinct hosts and UTM parameters suggests an attempt to obfuscate the true destination or to track phishing campaign effectiveness. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution lure.

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://druttle.ru/strik?utm_term=how+often+does+dividends+pay PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413867/normal_5fdb357fa186b.pdfIn PDF document text
    • http://yesnutural.space/methode_de_bobinage_des_moteurs_electrique4p5gl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500208/normal_6009cd2a2c5f6.pdfIn PDF document text
    • https://cdn.sqhk.co/nozesinipi/A6ijv7r/next_business_tycoon_cheats.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467979/normal_5fe653ee680a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450340/normal_5fdbaeb6ca4ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471958/normal_5fccf4cb5a579.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368221/normal_60077ac2705b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486351/normal_6014f5ebba94c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wotalagaxidi.rf.gd/inverse_operations_addition_and_subtraction_worksheets_ks2.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/cpa_cpe_reporting.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/79326193619.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/ossiarch_bonereapers_battletome.pdfIn PDF document text
    • http://molojagevatabu.rf.gd/bamu_university_result_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/69184083551.pdfIn PDF document text
    • http://numakuzugurewi.rf.gd/anyways_messenger_for_android.pdfIn PDF document text
    • http://ritopagagibuxu.epizy.com/71563614498.pdfIn PDF document text
    • http://dazesokagevak.rf.gd/triumph_bonneville_t120_custom_parts.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_off0000c6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CF 5124 bytes
SHA-256: 918fbbc8c0b39e2e0b839008f8511c99916c4b1b0af26289321618b5bed7f4b8
font_01_sfnt_off0000d872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD872 10364 bytes
SHA-256: 07ae047ddc77b85f528562b454678956df9d58acba2a95f265a625e401ac1f93

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