Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a73e81cb6fc05bd…

MALICIOUS

PDF

77.3 KB Created: 2021-04-26 09:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 664758ae86d15773a42a6f8de0b797e3 SHA-1: f372b74e6c17ff70955b705a30c6ca6695ed0d90 SHA-256: 7a73e81cb6fc05bd4de16975a6e0200e4e589fe0840e13bbac288af260f739b6
186 Risk Score

Malware Insights

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

This PDF file contains a link farm designed to redirect users to numerous other PDF documents, likely for SEO manipulation or to host malicious content. The primary URL, 'https://ponafet.ru/strik?utm_term=why+is+my+iphone+not+ringing+when+i+get+calls', is presented in a way that mimics a search result, aiming to trick users into clicking. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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://ponafet.ru/strik?utm_term=why+is+my+iphone+not+ringing+when+i+get+calls PDF link annotation
    • http://wow50.pro/72190985001ggfmp.pdfIn PDF document text
    • http://mavitrade.com/75673294220tzag3.pdfIn PDF document text
    • http://godisibipuvam.22web.org/14914700075.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500201/normal_602feb4f6aa86.pdfIn PDF document text
    • http://nomanodix.iblogger.org/35884133059.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475586/normal_5fed763a1abbe.pdfIn PDF document text
    • http://segwaywheelchair.ru/minn_kota_riptide_i_pilot_remote_pairing8t943.pdfIn PDF document text
    • http://doucheop.xyz/kuzoxidurizedr2o0x.pdfIn PDF document text
    • http://servisvds.ru/why_isnt_my_maytag_dryer_getting_hots8alj.pdfIn PDF document text
    • http://dfds.in/nasigexuxozubaj6ik1l.pdfIn PDF document text
    • http://jakor.pro/what_does_the_book_of_proverbs_teach_us_about_wisdomzq3n1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403422/normal_605f6a588b3bf.pdfIn PDF document text
    • http://lajulufubugo.22web.org/balkanski_spijun_lektira.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://814bd5e1-0b6f-40f8-b2e9-6ab0015c5eef.filesusr.com/ugd/cc77ff_f63b8c42b1d54877bc58ef8f35ca8040.pdf?index=trueIn PDF document text
    • http://rudavuzapu.rf.gd/luzulowimufalemakoforu.pdfIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_f8d7c6461a5d4bcd9f4894e3bdc486b3.pdf?index=trueIn PDF document text
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_18e6b34447aa4c05ac0400beef6aa906.pdf?index=trueIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_329e3f1fe9e648c6a50359b41e82dcae.pdf?index=trueIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_09246a57fb7d47a3958b7de6479565cb.pdf?index=trueIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_07f2fbe411d14a39aaa7a32164ae4269.pdf?index=trueIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_4bff63004d674caeb575e92430e09e4c.pdf?index=trueIn PDF document text
    • https://cd65756b-a9c7-4cca-9498-1747a6459195.filesusr.com/ugd/05eb20_193ca31c95734e9d90d5fd6738a18923.pdf?index=trueIn PDF document text
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_c651736717d2410e96eab6fb345e865c.pdf?index=trueIn PDF document text
    • http://vurowufufi.rf.gd/xizoso.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_off0000ef95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF95 5552 bytes
SHA-256: 33027cdb09dad83ff7890bc5f59b6669daf39f15fbc2990fc07d530e4b260d1a
font_01_sfnt_off0001026f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026F 10836 bytes
SHA-256: 59d5c72284e567c1d84bc793e10ca1894db45d0d05a139f57dd7433bc961472a