Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dcc578075e0a35c…

MALICIOUS

PDF

71.8 KB Created: 2021-05-04 08:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 757990a4fedfff697a36a957d84f5ba8 SHA-1: 778c9c6ff8f81f68441924d42089f00376f3f71e SHA-256: 6dcc578075e0a35cdc2bc0ecf558ca8734e69b8ec8316bc6cf9c709ba5008aa7
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common phishing lure, potentially using JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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.
  • 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=ion+usb+turntable+manual
    • https://cdn.sqhk.co/velujuvaxal/22wiupt/lamabejodasuwesarusabu.pdf
    • https://naruvoraxosu.weebly.com/uploads/1/3/0/8/130873998/pipalewiliwokatim.pdf
    • https://jazawimap.weebly.com/uploads/1/3/5/3/135346256/6024494.pdf
    • http://famozosivupiwij.sportsontheweb.net/what_is_meant_by_the_tragedy_of_the_commons_quizlet.pdf
    • https://cdn.sqhk.co/madagijoj/eidyhg8/pen_pineapple_apple_pen_guy_new_song.pdf
    • https://cdn-cms.f-static.net/uploads/4459034/normal_601972a37bd28.pdf
    • http://nusowutevu.getenjoyment.net/how_to_describe_heavy_rain.pdf
    • https://cdn.sqhk.co/tezikegoj/jaHjdia/getabirivegexiborononema.pdf
    • https://static.s123-cdn-static.com/uploads/4491969/normal_5fe1c85ebc2d2.pdf
    • http://kemikavar.mypressonline.com/sumegupa.pdf
    • https://static.s123-cdn-static.com/uploads/4446762/normal_5ff9065831a16.pdf
    • https://sapafusazefo.weebly.com/uploads/1/3/4/4/134496158/fbec196f.pdf
    • https://cdn.sqhk.co/ferorigife/sticijh/gosset_brut_excellence_tech_sheet.pdf
    • https://cdn-cms.f-static.net/uploads/4368227/normal_60638b7f2c054.pdf
    • https://zuriloteva.weebly.com/uploads/1/3/4/6/134623588/3395252.pdf
    • https://cdn.sqhk.co/pumopivosoba/cpG5zWa/highway_bike_race_3d_game_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bilisedutave.myartsonline.com/53747778243.pdf
    • https://uploads.strikinglycdn.com/files/87b6b46e-14ce-41e3-b166-4ea719062dca/gelit.pdf
    • https://s3.amazonaws.com/boduxatavepe/mesazibekizebugezabameb.pdf
    • https://s3.amazonaws.com/jiwisi/preposition_of_place_quiz.pdf
    • https://s3.amazonaws.com/napejaxosinages/how_to_fix_corrupted_data_on_ps4_without_losing_data.pdf
    • https://uploads.strikinglycdn.com/files/d5be9acd-75ad-4e2a-8018-3a1f25feaa82/public_speaking_for_college_and_career_11th_edition_chegg.pdf
    • http://kubomefewofumim.atwebpages.com/best_english_speaking_app_iphone.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd11.bin
6d4b3075fffc250b600652e2fc9f0e309e46f89c9988df6f748673ed3b5485ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD11 4908 bytes
font_01_sfnt_off0000eda3.bin
e8a8f358de2a5e8a86c6caa27624a9a72d727683271e57175037a8d5718c2b4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA3 10684 bytes

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