Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c89b28cfd385d22…

MALICIOUS

PDF

84.9 KB Created: 2021-03-22 12:16:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 34ef09190884474b92d8d19515bc05f2 SHA-1: 83e4b902ff02f260d5c2540537a93f7fd399ec28 SHA-256: 4c89b28cfd385d22be5ac0a28a23b343958cefc5876bdd455e4066c5b617f955
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 0.9990

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://soxebez.ru/aws?utm_term=should+new+construction+have+home+inspection PDF link annotation
    • http://nigavereke.mygamesonline.org/37626650187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406223/normal_5fd62974bd0d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481173/normal_5ff456afb470b.pdfIn PDF document text
    • http://winsbig.space/highway_safety_act_quebecmk545.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384647/normal_60300a7a115d1.pdfIn PDF document text
    • http://helpcontactform.com/rufonetixusifabiy4u6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477878/normal_5ff0cf13213d3.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/axis_bank_forex_card_reload_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456122/normal_603919c735064.pdfIn PDF document text
    • http://instgramcopyrightdispute.com/kilenowubepedenisif0k.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/netgear_nighthawk_ac1750_vs_ac2600.pdfIn PDF document text
    • http://fezelegafefuv.mywebcommunity.org/blank_clock_face_without_numbers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390381/normal_6057c1d52dbd0.pdfIn PDF document text
    • http://dreamingdeveloper.com/barbie_dress_up_games_for_pciyaj1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404523/normal_6026944673011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464082/normal_601240d5f2dde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454182/normal_602e1f64ceea9.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/jewizopukuni/pusaxesi.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/13301281284.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/miller_spectrum_375_plasma_cutter_price.pdfIn PDF document text
    • http://gixarewujedel.atwebpages.com/2002_ford_explorer_xlt_transmission_dipstick_location.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_d570f2a2098c4fd8a1615cc1ac8c8dcf.pdf?index=trueIn PDF document text
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_9529a4f0274c4992ae93c4e8fad01b4d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/82391681644.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_off0000fea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA0 5452 bytes
SHA-256: a161d9200ecb43c0a169365b5af108a532622eac21a0cc52611a84d09f0e64e8
font_01_sfnt_off00011102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11102 10828 bytes
SHA-256: e9cf14849e6e75e8bd462a0e8e9bfbfbc38b2635b6ed3e539d9e73bff34abf0d
font_02_sfnt_off00013613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13613 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3