Malicious PDF — malware analysis report

Static analysis result for SHA-256 f806d24dfe2a4a44…

MALICIOUS

PDF

87.1 KB Created: 2021-03-24 11:30:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 78c03aed005fe95165aa4008e0a865c0 SHA-1: 5373ca4beceeb6886b40aa6895c83ea7ea221979 SHA-256: f806d24dfe2a4a44f4a654211e7c14a43923d2cf2559e5892a460305a634d03d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://crophysi.ru/strik?utm_term=i%2527m+dreaming+of+a+white+christmas+song+from+home+alone PDF link annotation
    • https://faxefijuw.weebly.com/uploads/1/3/1/8/131872096/wugubisefa.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/RgjmWgd/oceanhorn_nintendo_switch_physical.pdfIn PDF document text
    • https://kutekedutowake.weebly.com/uploads/1/3/4/6/134635623/rejixaf.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/gozezi.pdfIn PDF document text
    • https://cdn.sqhk.co/vojazodelud/ibjLDjc/pac_man_championship_edition_2.pdfIn PDF document text
    • https://xubebedi.weebly.com/uploads/1/3/0/7/130776367/xofudev-zesoz-segesef-kadubej.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/00811b03efc9.pdfIn PDF document text
    • https://vozufoge.weebly.com/uploads/1/3/5/3/135346805/2468838.pdfIn PDF document text
    • https://rugexosijebup.weebly.com/uploads/1/3/4/0/134017508/kosalu.pdfIn PDF document text
    • https://vominitaxa.weebly.com/uploads/1/3/4/6/134677623/903d8b123028b.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/kovozenamofox/5748647018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c91d9b7-d799-4eb2-a7c7-174dca526828/kipeb.pdfIn PDF document text
    • https://9f503c4c-bf14-4dcb-9a7a-68e0e5bb3568.filesusr.com/ugd/8ac1ab_c9e3a8963dd143d5be3115f2e87df6d7.pdf?index=trueIn PDF document text
    • https://8e8ef6ac-913c-489f-8395-c30730e7ba0a.filesusr.com/ugd/f39c52_c67b2e9418264e81adcbb01eff6c34b5.pdf?index=trueIn PDF document text
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_71837a5411fe4ae1b3872302e1a5709c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df871df6-c845-43f8-bf96-f36218f2ded1/what_is_the_tone_of_a_song.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/jogawib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8597a40b-cf77-4d7c-af45-7d21c13b186b/dd_3.5_celestial_creature_template.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/lenovo_g50-80_i3_memory_upgrade.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/fujonevibafinuno.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_off0000f154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF154 5288 bytes
SHA-256: dffbfaca304de3f740f504673073fae55036048fa92404998d62c58f2a5585b4
font_01_sfnt_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 10840 bytes
SHA-256: 19fd227361ea21c631dbe2cc29e62120f0e09207c61a995b8e78385011537363
font_02_sfnt_off00012885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12885 16312 bytes
SHA-256: 028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b
font_03_sfnt_off00013e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E11 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3