Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2b893012f3c362…

MALICIOUS

PDF

80.5 KB Created: 2021-03-10 15:24:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96d6865d52486ae4ae64496cef0ac8c8 SHA-1: ff56305eb0d27a175d5a8d6ee5002dcfb26220ab SHA-256: 5d2b893012f3c3621f26a53453cb3087f8850d7ef391a4987a6eeaace22b9f34
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'nipisod.ru', suggesting a phishing or malware distribution attempt. The PDF structure and the presence of external URIs are consistent with techniques used to redirect users to malicious sites.

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://nipisod.ru/strik?utm_term=are+vivid+dreams+a+sign+of+good+sleep
    • http://jifarobajis.sportsontheweb.net/how_to_figure_out_ratios_6th_grade_math.pdf
    • http://komaxinatobofe.medianewsonline.com/massey_ferguson_35_petrol_engine_rebuild.pdf
    • https://cdn-cms.f-static.net/uploads/4457011/normal_5fd66014b8986.pdf
    • https://cdn-cms.f-static.net/uploads/4485580/normal_6031f09e1b29d.pdf
    • http://zakosemej.mypressonline.com/rebew.pdf
    • http://dipazekonowa.mypressonline.com/what_is_3_beeps_in_morse_code.pdf
    • https://static.s123-cdn-static.com/uploads/4366324/normal_5fe1ea0dac26d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jisijuvod.myartsonline.com/xafumumitoxigakawefur.pdf
    • https://s3.amazonaws.com/tujeviwakirawu/sadixepifexebasuvova.pdf
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_24ad9ab004ae4c2abecf37d0ce3f7b04.pdf?index=true
    • https://s3.amazonaws.com/senodiw/jepiteruminab.pdf
    • https://uploads.strikinglycdn.com/files/a6bda1b9-1164-4719-aaf5-b29fcd077114/is_the_justice_system_in_australia_fair.pdf
    • https://uploads.strikinglycdn.com/files/3dc42e89-fe86-4af5-85a7-829efaa8605d/the_black_hack_2nd_edition_boxed_set.pdf
    • https://uploads.strikinglycdn.com/files/4fa6fa09-af34-4766-9910-95974d4b696b/80697881747.pdf
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_b56d2642af1c4f519533598ca2881d6d.pdf?index=true
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_f88ec8ebf28f4244adf73fc85293713d.pdf?index=true
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_56b7f8e621c844c1ae3e46349332324d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/691b264b-46cf-4c93-96bd-8ac7cba2e797/sevulejolarogivogot.pdf
    • https://uploads.strikinglycdn.com/files/ca434e8d-57d0-4ed3-b544-c52af1309afe/relion_humidifier_reviews.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_off0000fd36.bin
2f197347a86f676d2b85d46d5d11c3420cee8fbdb57cc201e08c34ba537bb917		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD36 5412 bytes
font_01_sfnt_off00010f93.bin
034ce0c6ae88af3ff8b6b52db7b331c169a54122e8eaa61e2cd2a8201e66d712		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F93 10792 bytes

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