Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab16ed8703fd4201…

MALICIOUS

PDF

80.6 KB Created: 2021-03-04 23:50:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c4b8e24c3105dbc7e03119645c8b590a SHA-1: fb81a1e19bd382b62e24102c3e93adc4dee26c9b SHA-256: ab16ed8703fd4201343bcd3e28ab453ae30e027e9b314e86d986f9b8fae83950
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to a workout review, likely intended to direct users to malicious sites for phishing or malware delivery. The presence of embedded URLs and the link farm heuristic strongly suggest this is a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/123?utm_term=stronglifts+5x5+workout+review PDF link annotation
    • http://govuled.mywebcommunity.org/fabajoniluva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417414/normal_5fd992fe52cf1.pdfIn PDF document text
    • http://segipaxi.iblogger.org/new_hire_checklist_template_doc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490273/normal_5ffc83c137100.pdfIn PDF document text
    • http://ledivezakaw.iblogger.org/smith_and_wesson_915_kydex_holster.pdfIn PDF document text
    • http://jofufuzutaki.22web.org/hd_movies_apk_9._5.pdfIn PDF document text
    • http://kusafomidufe.mywebcommunity.org/rusipipunaditomel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407060/normal_5fcd860b9af45.pdfIn PDF document text
    • http://zesenadozefut.sportsontheweb.net/logitech_k360_wireless_keyboard_usb.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/dusubonifu/dakowetuzuxegebojamu.pdfIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_8fdf9dafbb694ef4b3e3bd1d7d7888f9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/023ba49e-f7a8-49a5-ac05-5b8bbd6fa651/60234667604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf9def03-8ea1-4f18-bcca-b406de7607af/1735622520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/211e040e-3cce-4c82-8eaa-952eed8efa64/zelewiwexixiwenafon.pdfIn PDF document text
    • https://2a009ac4-5770-49f2-ae16-4ce107243443.filesusr.com/ugd/59deca_19107559c0bc466fbafaf02359902088.pdf?index=trueIn PDF document text
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_787c593ab2ac47e0ad40a93733def495.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3115d536-3236-45e0-8d67-e34a70756102/sir_gawain_and_the_green_knight_part_3_and_4_summary.pdfIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_302acd56092d4f449f9ebe6a5e699ce4.pdf?index=trueIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_1a486fbf3c3d437481895e75fa3ba756.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/implementation_process_powerpoint_template.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_off0000fec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC4 5236 bytes
SHA-256: 03e5e972847578c1b636454fee56951ae2af2aa9937b01ef7b9720f31289dba8
font_01_sfnt_off000110cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CF 10528 bytes
SHA-256: 99d208192c332480261dcbbc8fa629820f648f0054337f7f59929faf6108bcdd

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