Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11c5a11210a077e…

MALICIOUS

PDF

102.7 KB Created: 2021-02-27 14:01:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 45d92988d844ba76df9041764eac8b88 SHA-1: 977dcc62d651b856bf8d6a1ee75d950f1fcd8889 SHA-256: a11c5a11210a077ec0051df6c0f97d5d41c64225fe8f39e4ebec643e7c6e56f6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or redirection to malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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/wix?keyword=physics+of+semiconductor+devices+sze+solution+manual PDF link annotation
    • https://cdn.sqhk.co/sowojusawepu/3djfhbI/tractor_supply_go_kart_parts.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/85251776152.pdfIn PDF document text
    • https://cdn.sqhk.co/xejokenu/qjeYfB4/musipobatube.pdfIn PDF document text
    • https://cdn.sqhk.co/wafavalufa/KsONhj2/piano_keys_chart_with_numbers.pdfIn PDF document text
    • http://rivozuzeno.mywebcommunity.org/57926161999.pdfIn PDF document text
    • http://katipef.medianewsonline.com/70476051627.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/Rjg2Nhj/mindshift_backlight_26l.pdfIn PDF document text
    • https://cdn.sqhk.co/miwavilusaji/6fqqhaT/91426140620.pdfIn PDF document text
    • https://cdn.sqhk.co/nosimasiv/YjigclK/mod_godzilla_king_monsters_full_movie.pdfIn PDF document text
    • https://xonujofepip.weebly.com/uploads/1/3/4/3/134385468/f2150da.pdfIn PDF document text
    • https://wiputexalivit.weebly.com/uploads/1/3/2/7/132740767/1023998.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/vieg1YY/jetira.pdfIn PDF document text
    • http://fupemagis.mywebcommunity.org/julifususafaxivavifakad.pdfIn PDF document text
    • https://gokaxavel.weebly.com/uploads/1/3/5/3/135316782/tajuvujisur_vewarelasa.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://jenowuzax.rf.gd/88569453271.pdfIn PDF document text
    • http://mopezuvo.epizy.com/waterco_salt_chlorinator_manual.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001170a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170A 5356 bytes
SHA-256: 5a982c4542e5f124c67855c15af3efe4abb59bbf1e825c8aea2688b2ffe7d7a6
font_01_sfnt_off00012918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12918 18900 bytes
SHA-256: 47c8ce571e5f2ac900faa2c141270a7cafd0eb00c862d787e29c67e56a66f3a7
font_02_sfnt_off000164a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164A6 16892 bytes
SHA-256: a369bc57625502c98522cf39ab33d9eed08bc9cd6a509b11f871a15a9cb90924
font_03_sfnt_off00017c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C69 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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