Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90821fd9d60b61c…

MALICIOUS

PDF

80.5 KB Created: 2021-03-13 17:14:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 03eaeb51c4043eb64ce7545135561916 SHA-1: 86b79b906591a3e7adabcd753a691b30ed5bcf84 SHA-256: a90821fd9d60b61cbc6d423abf01b4f2e9f7b0058f22bf349e41ae939348c089
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users to malicious sites. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

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
  • 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://jumiwimov.ru/strik?utm_term=v1_1+qu%25C3%25A9+son+los+primeros+auxilios+psicol%25C3%25B3gicos+%2528pap%2529 PDF link annotation
    • https://cdn.sqhk.co/pimidima/Ljcjcgc/download_boomerang_video_from_instagram.pdfIn PDF document text
    • http://potenciy.xyz/multiple_intelligences_test_for_studentsq1lkz.pdfIn PDF document text
    • https://cdn.sqhk.co/vagizabibo/gie8khj/85049879924.pdfIn PDF document text
    • http://instofficial.online/time_capsule_apple_router_setup8qjl8.pdfIn PDF document text
    • http://moperala.iblogger.org/vujuna.pdfIn PDF document text
    • https://cdn.sqhk.co/tegatiwuwax/gmyijeP/61221332964.pdfIn PDF document text
    • https://cdn.sqhk.co/vawadawuleja/djbig29/kidcity_gaming_madden_20.pdfIn PDF document text
    • http://reduslim-italia.website/phase_10_card_game_online_with_friendsvuos9.pdfIn PDF document text
    • http://item-get.top/poviweniderubelugemuvikar3u.pdfIn PDF document text
    • https://cdn.sqhk.co/duvetezoje/wIsij1E/nipixiguvikorezor.pdfIn PDF document text
    • https://cdn.sqhk.co/vefutifeves/KijjbQE/pofomunikoxodez.pdfIn PDF document text
    • https://cdn.sqhk.co/fivufotimad/ctggMif/draw_a_stickman_sketchbook.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/zolerazowubow/the_man_in_the_high_castle_season_3_episode_2_subtitles.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/minaxek.pdfIn PDF document text
    • http://lofekelatek.epizy.com/dafositawitepujis.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/somumobetopujuravefap.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/cycle_se_aaya_song_dj.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_off0000f98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98A 5928 bytes
SHA-256: b4086bf2edefa25c997ea3165323d33dba29a7338ba324aa740d42a774f07797
font_01_sfnt_off00010d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D46 11396 bytes
SHA-256: fb778ed3b8326de0bea73fd6845ed306285bccfdf11d9b1375d6996185b948d9

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