Malicious PDF — malware analysis report

Static analysis result for SHA-256 284213115cd61c14…

MALICIOUS

PDF

90.2 KB Created: 2021-04-20 20:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 539547eebe200158b1a78ef5707e6702 SHA-1: 56e5280caa0ec2b3e29da3da872f3c6531b5cbb4 SHA-256: 284213115cd61c1402026e6964f2faa6744c76843648a7bfd948714f2e702387
206 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. It uses a callback-phone (TOAD) lure. 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 0.9998

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://maypoin.ru/strik?utm_term=post+office+savings+bank+contact+number PDF link annotation
    • https://cdn.sqhk.co/wevexifimur/0Cv7Bgj/bonubodiximininudewug.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/anAhgha/82292514620.pdfIn PDF document text
    • https://cdn.sqhk.co/tawibonikigo/Z9gghd7/89960912070.pdfIn PDF document text
    • https://cdn.sqhk.co/pobumepova/ehchjha/stickman_skate_battle_hack_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420747/normal_601aef10f0a6a.pdfIn PDF document text
    • https://cdn.sqhk.co/lexuxeza/PD5jcio/avatar_english_movie_full_hd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421612/normal_6049df23d6c06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496170/normal_5ff147a043585.pdfIn PDF document text
    • https://cdn.sqhk.co/pupewudoj/i2sbE7M/draft_compromise_agreement_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453560/normal_5fcc5e4052789.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462688/normal_6049f6fbadd1b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_a80c2cc23eed4219a9f0aa6c775708e5.pdf?index=trueIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_fff5810a889540d6ba0c1ce2cf56d7c3.pdf?index=trueIn PDF document text
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_a8654f9d577741e384071f0b4f3f44b1.pdf?index=trueIn PDF document text
    • https://78f121e6-5824-477f-9480-4bf23eba804c.filesusr.com/ugd/9564ad_de9edadd661c40e8851d81f55f99d6e7.pdf?index=trueIn PDF document text
    • https://79d8ee67-2172-45f8-9737-086b37aa5bdf.filesusr.com/ugd/2ab2ae_3478305ba3304308bf43e638ba84aa71.pdf?index=trueIn PDF document text
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_dd6c49df5bdb4814ba16660d10ee343a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liluvad/transunion_credit_report_contact_phone_number.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/shure_blx_sm58_beta_58a.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_off0001205e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205E 5436 bytes
SHA-256: 7effc72b138606d40f5ff0533061f6d12cd0700f8a53fc3abf09c32ab8398e70
font_01_sfnt_off000132de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DE 12000 bytes
SHA-256: 46ca3260e56b81ada80b3e81dd7e6732f357b59a49a5275c719fb4ad618c1b23