Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a8f036c834a1f6…

MALICIOUS

PDF

97.5 KB Created: 2021-03-20 21:34:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b9d72bdc1b27606c3683ba746daa904a SHA-1: ee80730d1b1af21b3f4d954113f6aaf90b1413ed SHA-256: 67a8f036c834a1f601ecfe861a0543acca7ca631b5adf577b1d96d4e7d31f684
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with the primary one being `https://resalured.ru/aws?utm_term=how+much+does+a+beginner+freelance+writer+make`, suggesting a lure related to freelance writing income. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates the PDF is designed to host many links on disposable domains, further supporting a phishing or malicious redirection scheme. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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.
  • 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://resalured.ru/aws?utm_term=how+much+does+a+beginner+freelance+writer+make PDF link annotation
    • https://cdn.sqhk.co/vumulevezuf/hikicgg/pirufufaw.pdfIn PDF document text
    • http://zuzimosutikume.22web.org/novomokaxejanab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376088/normal_6015c4b56123e.pdfIn PDF document text
    • https://cdn.sqhk.co/gasidonoda/uheDggQ/diy_fine_tip_capacitive_stylus_for_android.pdfIn PDF document text
    • http://rijepesejib.22web.org/gavupusubidabotoxarovak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450883/normal_6012b64609b29.pdfIn PDF document text
    • http://bumomuvo.iblogger.org/business_information_group_pa.pdfIn PDF document text
    • https://cdn.sqhk.co/zomidami/jugh2jb/xorasunuletum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389358/normal_5fe2e216ef50f.pdfIn PDF document text
    • http://nigufuf.iblogger.org/18133131651.pdfIn PDF document text
    • http://zinabexodepo.iblogger.org/actors_in_public_policy_making.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375076/normal_60084976a8adb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lukirexuwi.rf.gd/wogovonetuzeg.pdfIn PDF document text
    • http://xugonapo.rf.gd/49671294051.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/76179739582.pdfIn PDF document text
    • http://xeravujowa.epizy.com/95391766103.pdfIn PDF document text
    • http://jiforexawa.rf.gd/how_many_calories_in_subway_6_inch.pdfIn PDF document text
    • http://gukofeverozek.rf.gd/what_is_oxford_reference_style.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/how_to_set_the_timex_alarm_clock.pdfIn PDF document text
    • http://jisevara.rf.gd/8699789488.pdfIn PDF document text
    • http://zuwodiruvukima.epizy.com/wusakewujadufep.pdfIn PDF document text
    • http://rakorexifaxokur.rf.gd/kofunapuvadexa.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/82688327268.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/gusaseralatekijezi.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_off0001348f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348F 5692 bytes
SHA-256: 222a20fcbff74498394835399f08c0ae5abb2337fe16605f027f2115314f5996
font_01_sfnt_off000147c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147C7 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00015055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15055 11096 bytes
SHA-256: 3656c0352128e8e86a2540e24bf4814d0a7524d02764e92f5f849db188dcc3fd

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