Malicious PDF — malware analysis report

Static analysis result for SHA-256 7114df2a98cf6377…

MALICIOUS

PDF

95.4 KB Created: 2021-04-08 00:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8610240d82a8cacdd73c28dc9de1fe82 SHA-1: 43149fe097b9bb05a57dceb23da9dcfc604d64f7 SHA-256: 7114df2a98cf637755f91c2b29d4b85c771a801d144de295fe20e80cc2c5613a
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body's garbled content and the presence of numerous links suggest an attempt to obscure the malicious nature and potentially engage in SEO poisoning or link farming to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+much+energy+does+tesla+use+per+hour In PDF document text
    • https://cdn.sqhk.co/ruzesowasu/5ADWjcN/egg_inc._game.pdfIn PDF document text
    • http://nesarose.sportsontheweb.net/analysis_of_experimental_data.pdfIn PDF document text
    • https://cdn.sqhk.co/tefaxobaf/hjicZFc/bike_game_for_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/chigdhi/hmrc_grant_for_self_employed_second_grant.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426415/normal_605277be6b14f.pdfIn PDF document text
    • http://zesivez.iblogger.org/85214593956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465701/normal_605a7e388b496.pdfIn PDF document text
    • http://rimiripa.mypressonline.com/types_of_aneurysms.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/purawuma/rawosevemetuzurogetu.pdfIn PDF document text
    • http://fararisujis.myartsonline.com/20000_leagues_under_the_sea_chapter_12_summary.pdfIn PDF document text
    • http://putojoner.rf.gd/how_to_earn_extra_money_from_home_legitimately.pdfIn PDF document text
    • http://pababevo.epizy.com/dnd_5e_kobold_guide.pdfIn PDF document text
    • http://kijijaxozaro.epizy.com/4th_grade_math_worksheet_word_problems.pdfIn PDF document text
    • http://gepafelixadu.onlinewebshop.net/77153550882.pdfIn PDF document text
    • http://rezemefu.rf.gd/duka_hithena_adara_wadan_sinhala.pdfIn PDF document text
    • http://danebusuji.onlinewebshop.net/density_of_dna_molecule_labeled.pdfIn PDF document text
    • http://raxaxeve.rf.gd/94509026067.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/osrs_dragon_gloves_guide.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_off000135aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AA 5644 bytes
SHA-256: 3dd74f72e1e5cd3a26957db14dfe71e1d8af0afa866c929384c15a672ec5e713
font_01_sfnt_off000148c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C7 11600 bytes
SHA-256: 79f4bc977663e1c9e863325f1a7a0f776fa57ef05bb4844bd7074f3fb04b3dc5

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