Malicious PDF — malware analysis report

Static analysis result for SHA-256 b857f4c52f269656…

MALICIOUS

PDF

70.0 KB Created: 2021-01-31 05:02:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1fbb4429f9d4d8d6745acd423213ff32 SHA-1: 296b6a16808aab3be5621c9706380ec775563fdf SHA-256: b857f4c52f269656eac5df9b757ea92dbd247c98452e36ec2cfaab3380382c49
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains multiple embedded URLs, including one that appears to be a redirector for a link farm, and another that is a direct link to a PDF hosted on disposable infrastructure. The document body, though heavily obfuscated, suggests a lure related to a search query, likely to trick users into clicking the malicious links.

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://baarspo.ru/123?utm_term=costco+cauliflower+rice+stir+fry PDF link annotation
    • http://contact-git.top/gibupavikidadezuxogigola5ia8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393890/normal_5fe1563e6d156.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/tzuheQg/romantic_ringtones_2019_2020_love_song_ringtone_free.pdfIn PDF document text
    • http://sberin.xyz/bonulilozoxozajovinacsqz1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375708/normal_6012b082141eb.pdfIn PDF document text
    • http://kamini33.ru/pnb_rock_trapstar_turnt_popstar_downloadlgrm1.pdfIn PDF document text
    • https://cdn.sqhk.co/fadejiweruw/bBSpgcC/the_archers_bbc_theme_song.pdfIn PDF document text
    • http://bapupozizevose.22web.org/combining_like_terms_worksheet_math_aids.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
    • http://jujonejetas.epizy.com/batman_cavaleiro_das_trevas_animao.pdfIn PDF document text
    • http://nadurajamewe.epizy.com/missguided_stores_in_uk.pdfIn PDF document text
    • http://fujatelet.epizy.com/85370222842.pdfIn PDF document text
    • http://zakuvusebaj.epizy.com/safety_data_sheet_definition.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_off0000c5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EF 4868 bytes
SHA-256: dcc735512d561ca0869f25f91693e145f8e6b225ac21e258aa227cd4dc210dfc
font_01_sfnt_off0000d6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AD 11676 bytes
SHA-256: bab9263a231d6ca97f0485c6080f5741cc84d5fc3f0b25264e5f5b7546fff349
font_02_sfnt_off0000fd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD05 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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