Malicious PDF — malware analysis report

Static analysis result for SHA-256 53cfecf6a8a9e12a…

MALICIOUS

PDF

77.8 KB Created: 2021-02-20 21:25:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 11bd066c1cd310b647f6e707f8dd9965 SHA-1: e6f0e020f1e1afd56839292f3bc3c7a5731955aa SHA-256: 53cfecf6a8a9e12a0112f4aaaf60ada4a9e2dc7ecb16a1d25cb96b70e5244316
164 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm and a phishing lure, with a high ML classification score and ClamAV detection. The embedded URL 'https://druttle.ru/123?utm_term=denon+soundbar+dht-s514+price' is suspicious and likely leads to a malicious download. The PDF also contains a large number of external links, suggesting a SEO-based lure to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/123?utm_term=denon+soundbar+dht-s514+price PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415308/normal_6018ce1047c60.pdfIn PDF document text
    • http://rerikadarax.iblogger.org/96358144659.pdfIn PDF document text
    • https://silepokow.weebly.com/uploads/1/3/4/3/134366863/lodunin-kopivo.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
    • https://s3.amazonaws.com/gupawupigawono/sisunerasasifibala.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/almidon_como_esta_formado.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/non_chronological_report_examples_ks2_tes.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/jojenikanonovidob.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/ziwubezudolariz.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/29368378236.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/engelsons_falkenberg_storleksguide.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/19786407407.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/jifubapotazebukun.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/come_disattivare_aggiornamenti_automatici_app_android.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_off0000e625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE625 5444 bytes
SHA-256: bb1e97505426333330570b42e39d9dd11f87339c9482b6f599b6049ea83d4269
font_01_sfnt_off0000f8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AE 10352 bytes
SHA-256: d79ada6b1f6bf90dd3deaed7a244863bcc6979f9d568831825098f4eae6e0239
font_02_sfnt_off00011c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C01 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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