Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ab1183cc290c59…

MALICIOUS

PDF

92.1 KB Created: 2021-02-18 14:40:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2a114b9bb8d4cbd81fc5852cdb24b122 SHA-1: 84b30bb42b174acc8ce0a38f969e2d3c442e6cce SHA-256: f1ab1183cc290c59afc461b59c1500aac936433766030e64a3b62906da20ba50
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains text related to 'La muerte de obito español latino', suggesting a lure or theme for the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://yafferge.ru/strik?utm_term=la+muerte+de+obito+espa%25C3%25B1ol+latino In PDF document text
    • https://cdn.sqhk.co/fokatekox/hROFihD/touchgrind_bmx_2_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/zisuxemop/ghdFjgJ/burger_shop_free_cooking_game.pdfIn PDF document text
    • http://idealica-italiauficiale.website/android_game_development_unitybvjwl.pdfIn PDF document text
    • http://bopepon.22web.org/i_am_an_albatross_song_320kbps.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/iahaujl/truck_parts_near_me_open_now.pdfIn PDF document text
    • http://creamwalls.online/fuxineditufomabusovatasyvehn.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/jf3Sjac/different_notification_sounds_for_different_apps_samsung.pdfIn PDF document text
    • http://momentshop.website/47568737872ivirp.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/2iiKFPp/tilonawopitufanerozufon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460708/normal_601fb06a773e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370064/normal_5ff4a5b384f5f.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/xixonu/possessive_genitive_case_exercises.pdfIn PDF document text
    • http://tereneduzoz.epizy.com/xinizixopuvisegepam.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/84197352500.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/93463138539.pdfIn PDF document text
    • http://wowifimeziv.rf.gd/59874000772.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_off00011a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A46 3348 bytes
SHA-256: a40d2ac18551de3a2ebc890a2fac99e1a773aa87f41022aa52bb23a8aab249ec
font_01_sfnt_off0001264d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264D 5396 bytes
SHA-256: 132a24c8e2ee143c2951ca2b5feba3df959745f0dc12bb0ad21448fa0dffa687
font_02_sfnt_off00013843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13843 12468 bytes
SHA-256: 362f3fb922a91b4783ca19d7cd899380b659877825f84efedab0ba83abe83b3f

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