Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d56a13e29f394aa…

MALICIOUS

PDF

77.7 KB Created: 2021-03-16 20:18:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 970a75d50d50c6d385177b82a27ec170 SHA-1: 2932d5df006ee4960e3d43db6dc449bbcc3c3199 SHA-256: 5d56a13e29f394aad7b8a7bb82e3730f06938919c80cf1ad70f1a6a1f2af970f
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan threat. It contains numerous embedded URLs, with several pointing to suspicious domains, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate structure designed to host many links on disposable domains, reinforcing the phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xajibur.ru/strik?utm_term=the+boy+in+the+striped+pajamas+book+pages PDF link annotation
    • https://gadufekovofu.weebly.com/uploads/1/3/4/7/134764592/vinigubutigijivasufa.pdfIn PDF document text
    • http://nizagose.66ghz.com/76552771808.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384145/normal_5fe3ea6087ed4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382952/normal_5ff677d558fef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392210/normal_60502276c48b6.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/ghg2GBR/kadoxigiwawid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495391/normal_5fd35123574ad.pdfIn PDF document text
    • https://cdn.sqhk.co/vozaxodep/bgd3gir/bedroom_furniture_sets_clearance.pdfIn PDF document text
    • https://xesuxikoju.weebly.com/uploads/1/3/4/0/134095833/41470f3.pdfIn PDF document text
    • https://soguleta.weebly.com/uploads/1/3/4/3/134305846/7f656694c3033e.pdfIn PDF document text
    • https://biwakegexenulu.weebly.com/uploads/1/3/4/4/134437141/06f8aac292a031.pdfIn PDF document text
    • https://cdn.sqhk.co/parabeset/gjeighi/transmission_jack_adapter.pdfIn PDF document text
    • https://cdn.sqhk.co/tojemapimibo/jl5fM3X/core_math_sheets.pdfIn PDF document text
    • https://cdn.sqhk.co/jinuzekovodi/ifib8ia/81666333086.pdfIn PDF document text
    • http://zimagobotas.22web.org/23924222492.pdfIn PDF document text
    • https://mufuwavujove.weebly.com/uploads/1/3/4/0/134042856/4ba235b7d3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417422/normal_6023d217b5db4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/70121fb0-cfb1-4121-86c7-ed276bdddf9c/18528853995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48960c5c-119e-4845-9dae-6946d2e83d8c/the_good_the_bad_and_the_ugly_flute_sheet_music.pdfIn PDF document text
    • http://wexekokapirukam.rf.gd/wamufugavuvuwin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/943d11c5-b3c0-45de-b419-68a3189f6793/38984251920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bc75d31-7ee0-47e1-b597-cb894495c557/lilikopogek.pdfIn PDF document text
    • http://fesusate.rf.gd/queen_the_game_t_shirt.pdfIn PDF document text
    • http://modunozig.rf.gd/how_to_use_msr206_reader_writer.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_off0000ef48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF48 5672 bytes
SHA-256: 9d0a55deab9a40c66af0b5640b806b571f37725d0946e37958755110de209b12
font_01_sfnt_off00010268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10268 10960 bytes
SHA-256: f98adaa5694356b86f76847accd07c1ff17c3a7e90a91184d7cf937d0d97b0d6