Malicious PDF — malware analysis report

Static analysis result for SHA-256 2236fa65d830794d…

MALICIOUS

PDF

77.8 KB Created: 2021-03-25 17:08:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 784b28998da7819ad5d95fa2fa94ba1e SHA-1: 6eacd4b4020f49de563eb197bd6511089b8a4e88 SHA-256: 2236fa65d830794d7f3c9ad64749c2e5f20dde544f38966374039f9a27948f63
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains heuristics indicating it is a link farm and a callback phishing lure, suggesting a scam or phishing attempt. The embedded URL points to a suspicious domain, likely serving as a landing page for malicious content or further redirection. While no scripts were directly extracted, the nature of the PDF and the presence of external links strongly suggest an attempt to trick the user into visiting a malicious site, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://nipisod.ru/strik?utm_term=how+to+reset+a+linksys+re6500 PDF link annotation
    • http://pro-konditer.com/12141708659wtfgb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_6041ea2dbc3b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415937/normal_604d78b9a5043.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479705/normal_5fd8cfce701f8.pdfIn PDF document text
    • http://gsmall.space/merge_with_adobe_acrobat_readeranegi.pdfIn PDF document text
    • http://health-top.ru/anunaki_winamp_skin_downloadcv45e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377909/normal_5ffe94437a09b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373797/normal_600cf2a7500ba.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/tonisefoteka/how_to_setup_jabra_elite_75t.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/intelligence_journal_author_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/how_long_do_you_leave_splat_bleach_in.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2921e495-3212-441c-80ce-2a63db9c84d1/12956204395.pdfIn PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_8661ddec5ddf481582846d78428e4c37.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/769db88c-0b7b-40d0-bb8a-06cd65b4bf67/geveledelugekifopuku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06ed58b2-c3b4-4120-8782-353eff394cd3/negeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b2c7b17-77f5-414f-8d30-da190426c9cc/holden_evening_prayer_music.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/mikosunekekezosulexogova.pdfIn PDF document text
    • https://a96990da-dd17-4b11-844c-aba2d588d1b6.filesusr.com/ugd/5e5e7b_3e67e03f57e447cb8ede8222eff0925d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/plan_unico_de_cuentas_colombia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34e01da1-c0b3-4c82-9736-058ce14d5813/microsoft_word_for_pc_windows_10_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/online_challan_app.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_off0000e60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60B 5108 bytes
SHA-256: a9fe4ce84e8a91c4b37d79153b1994b9d62fa853d5f4243f9e3f28eb9d2ece2b
font_01_sfnt_off0000f77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77D 10512 bytes
SHA-256: a890a593aba4c48676c9d73501f778dc0bf3067054683c3330f94a3ebcac76c8
font_02_sfnt_off00011b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c