Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb16fbe124d6a2ed…

MALICIOUS

PDF

78.1 KB Created: 2021-03-22 09:50:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9e8609c16f7502b461669f82c86bca3e SHA-1: bd3e443c0f82bf4461fb74e14ca81db575ee3521 SHA-256: fb16fbe124d6a2edd616cff0a354feab2c7b146e017ab67b398b992eb401b5a0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable domains and employing UTM parameters, indicating a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure suggest an attempt to trick users into visiting these sites, likely for phishing or malware delivery.

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://xajibur.ru/strik?utm_term=the+things+they+carried+sparknotes+field+trip PDF link annotation
    • http://dmgameplan.com/113124096344233a.pdfIn PDF document text
    • http://idealica-co.site/topomalunufex4bos5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490722/normal_601b323c02d06.pdfIn PDF document text
    • http://100naturals.fun/football_game_2019_for_pcbwzqv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381551/normal_6021d4939b676.pdfIn PDF document text
    • https://padobijitoxu.weebly.com/uploads/1/3/1/0/131070591/2221567.pdfIn PDF document text
    • http://storeplus.info/85840751869v7pan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427529/normal_5ffcefa1e097a.pdfIn PDF document text
    • https://numetoximo.weebly.com/uploads/1/3/4/7/134717633/3b3720d.pdfIn PDF document text
    • https://gimitowogavu.weebly.com/uploads/1/3/4/7/134746983/riwebebufafal_juluron.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416923/normal_601837328b795.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449965/normal_602c83ffa7c89.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/2ff6b0db-9baa-4b59-adf2-28243eb77e67/can_i_put_two_black_ink_cartridges_in_my_canon_printer.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/gopebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc2ffab6-93f4-437f-b89d-e110edb04057/insinkerator_hot_water_tap_only.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b900a8ae-3335-4e32-829f-ae08de166d3a/lg_inverter_direct_drive_front_load_washer_spin_only.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ec5e0d4-e462-4386-b644-754f1c2cc9d2/kudejop.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/organic_vanilla_extract_nutritional_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7324effd-4aa4-46e2-99bd-05ea0cde2b7f/35041684015.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_off0000f480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF480 5532 bytes
SHA-256: 28041c4d43f8b6be6603be6c9eafe22624afc074ee4baceb8df1720f3f1280f3
font_01_sfnt_off0001075d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075D 10444 bytes
SHA-256: a3dff0808fcfd5dab61b0676f0bf41f57a22b32bb67acd479367bd1fde349cb9

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