Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c711c678767ca84…

MALICIOUS

PDF

70.0 KB Created: 2021-02-25 05:43:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2857dc154ff8a6726818a08bafa8bd64 SHA-1: 07e8dd2486d0f8185fcf0af9b617c72e9428824a SHA-256: 2c711c678767ca84cc3a4f419efc388b4230465c5a50d8d51b06e09501c1a96c
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, disguised as a service manual, which is a common lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple disposable hosting domains and link farms further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/wb?keyword=john%20deere%20310%20b%20backhoe%20service%20manual PDF link annotation
    • https://segalupozido.weebly.com/uploads/1/3/0/7/130738693/c005fad5897.pdfIn PDF document text
    • https://cdn.sqhk.co/mojuzizimu/iihjeHA/19817446198.pdfIn PDF document text
    • https://cdn.sqhk.co/padasagam/ggijFig/nostalgia_critic_commercials_canada.pdfIn PDF document text
    • http://salufogi.iblogger.org/define_a_spreadsheet_application.pdfIn PDF document text
    • http://gasufulezexe.22web.org/caught_up_movie_1998_free.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/what_is_the_nypd_physical_test.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/the_silence_of_the_lambs_clarice.pdfIn PDF document text
    • https://cdn.sqhk.co/gifidupuzuv/jcPgcE8/42546970545.pdfIn PDF document text
    • https://nufujemirifo.weebly.com/uploads/1/3/4/8/134868255/1446295.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bupagaruwizuzu.epizy.com/little_house_on_the_prairie_season_1_episode_19_cast.pdfIn PDF document text
    • http://lituvatitibew.epizy.com/good_clinical_practice_guidelines_australia.pdfIn PDF document text
    • http://rafaturewixivan.epizy.com/65259697786.pdfIn PDF document text
    • http://dokewisikod.rf.gd/zepetariroxoti.pdfIn PDF document text
    • http://dozipebijegubig.epizy.com/36594813213.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_off0000d2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BC 5792 bytes
SHA-256: 1cbc500f73304af0466b8ccf3cb1eeed1d8b4775f87ef9d7903b97ffc95a643a
font_01_sfnt_off0000e64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64B 10720 bytes
SHA-256: 3fcab4bacfa49b99a8ac729c234e8a69abcd991f8b82b3c6b48364653466f783

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