Malicious PDF — malware analysis report

Static analysis result for SHA-256 522ec0158a585c3b…

MALICIOUS

PDF

76.3 KB Created: 2021-03-23 19:46:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 58852dcce0b90575cb119b3dc05ec4ed SHA-1: 23344b87527eacf1da573fd9b021b187992ffd97 SHA-256: 522ec0158a585c3b76961a02dc25cbe5d8f3eddf753d7449f5e899d601db54d8
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains, and is presented as a "Linux tutorial pdf download" to deceive users. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=linux+tutorial+pdf+download PDF link annotation
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/gefapagosotax.pdfIn PDF document text
    • http://monongzhlh.space/mavebepijimapejutera7md.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371014/normal_5fd93d47a542f.pdfIn PDF document text
    • http://oblakova.ru/how_to_use_mechanical_timer_switch_for_lights578h0.pdfIn PDF document text
    • http://neojust.ru/solving_quadratic_inequalities_by_graphing_worksheeto9rhe.pdfIn PDF document text
    • http://ergors.space/whatsapp_emoji_games_with_answersraoxc.pdfIn PDF document text
    • http://afracheat7.xyz/exercices_adjectifs_possessifs_fle_a1k30f6.pdfIn PDF document text
    • https://mekaxojukana.weebly.com/uploads/1/3/1/3/131379168/gudarujejekix_pubalokubeparin.pdfIn PDF document text
    • http://poopo.ru/first_alert_carbon_monoxide_alarm_mounting_guide_templaterlnj6.pdfIn PDF document text
    • https://dizuzoboxok.weebly.com/uploads/1/3/4/3/134351397/tifebalowos_savivevib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445326/normal_5feb4ed659e99.pdfIn PDF document text
    • http://4338bacchus.com/92489136599alaie.pdfIn PDF document text
    • http://pagebake.com/the_redemption_project_season_1_episode_2hd37n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387920/normal_60599109de098.pdfIn PDF document text
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/924849.pdfIn PDF document text
    • https://mowerezudajam.weebly.com/uploads/1/3/5/9/135966589/gufevajajaralako.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414491/normal_603b6cd0d0b72.pdfIn PDF document text
    • http://nubolutlion.xyz/lugunipululawabepw1.pdfIn PDF document text
    • http://pycnidwzxc.info/xenanutulamojepagisowogistz3ei.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472221/normal_5ff1d5f180072.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zekovulelopur.epizy.com/aluminum_oxide_structure_formation.pdfIn PDF document text
    • http://vedumojaje.epizy.com/garolite_sheet_black.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_off0000ecd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD0 4960 bytes
SHA-256: 5b7a2064482528a59da2390a0ad7749968ae48fba75dfc29fa865fd733e5bc4b
font_01_sfnt_off0000fddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDD 10656 bytes
SHA-256: 4107477b32ac430a5de39872155c7eab3b4ee79f6cea1ef7b33485af13dd38e1

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