Malicious PDF — malware analysis report

Static analysis result for SHA-256 8655d21b4f4fae30…

MALICIOUS

PDF

81.0 KB Created: 2021-04-24 07:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0f05ee5e69a9d67a2dfc1f5e4b99a14f SHA-1: 28b5cbf9bd06f0a8a7dccf3470c94ec38bdf8b08 SHA-256: 8655d21b4f4fae30192baa13103894477f64da82ecd2a667600661cee17937fb
206 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The presence of a callback lure heuristic indicates an attempt to engage users via phone for fraudulent purposes. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious intent, likely to redirect users to malicious sites or initiate further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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://soxebez.ru/strik?utm_term=hp+stream+11.6+celeron+n4020+chromebook PDF link annotation
    • https://pukefigagarit.weebly.com/uploads/1/3/1/4/131406744/jowoj.pdfIn PDF document text
    • http://pivojowemetobiv.mywebcommunity.org/circle_of_fifths_guitar.pdfIn PDF document text
    • http://afterdealer.pro/female_body_languagea26vd.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/all_modal_verbs_in_english_grammar.pdfIn PDF document text
    • https://tekofudarazot.weebly.com/uploads/1/3/1/3/131381521/fumowu_ludelog_kenaso_davaje.pdfIn PDF document text
    • https://jewelilug.weebly.com/uploads/1/3/4/3/134331877/miwoju.pdfIn PDF document text
    • https://nupuwuzom.weebly.com/uploads/1/3/1/4/131438231/5129457.pdfIn PDF document text
    • https://fuxiwajusefu.weebly.com/uploads/1/3/4/6/134617271/5a954ab12ad3.pdfIn PDF document text
    • http://crysety.xyz/bojojafofujegagonnrih.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380214/normal_5fd88e664fbfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386074/normal_601cd4c106cb2.pdfIn PDF document text
    • https://kasozufadoji.weebly.com/uploads/1/3/4/5/134523760/42cadbcdd8.pdfIn PDF document text
    • https://xorusisu.weebly.com/uploads/1/3/4/3/134314808/judagem-dosuzogaj-woxidivupu.pdfIn PDF document text
    • https://bukodagunotul.weebly.com/uploads/1/3/4/0/134012399/jituwutakugunod.pdfIn PDF document text
    • http://ru-order-687646765445.art/554248753150e26h.pdfIn PDF document text
    • https://ranadapibefa.weebly.com/uploads/1/3/0/8/130874213/toxokiduledivedugeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408596/normal_5fc6d69c1ef63.pdfIn PDF document text
    • http://alexandreablog.com/oster_blender_chopper_attachmentuwwps.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/76975283583.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/lezutizorovelilegilo.pdfIn PDF document text
    • http://furunes.onlinewebshop.net/mini_air_cooler_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/geveduxavokapaku.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_off0000fb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4E 5940 bytes
SHA-256: 41356180d1a6f33de60e6b7c829042324e453be3630ee5f8ace184172ce40dda
font_01_sfnt_off00010f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F63 11384 bytes
SHA-256: 1ff8423d0703aff728a4e5f485ca54d95f9e32409c41955b130c703eb9c892cb