Malicious PDF — malware analysis report

Static analysis result for SHA-256 08661ed30fcaf71c…

MALICIOUS

PDF

79.3 KB Created: 2021-03-29 10:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f4984027b813493d2ce93068c0dc4b57 SHA-1: 2172b3ebf653f66100ac08fa5ebaa1c40e9914b7 SHA-256: 08661ed30fcaf71c2b3b39282dcd5c929d46df49c1d5d684f8c7da17faa96c2c
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/award?keyword=rectification+of+errors+journal+entries+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4463809/normal_5feb41360ba2a.pdfIn PDF document text
    • http://tubixiwuwura.iblogger.org/ruguvigusobixuxibolumikas.pdfIn PDF document text
    • https://gemaxapofa.weebly.com/uploads/1/3/2/6/132681544/vefazifi-xonugewafuwo-xusej.pdfIn PDF document text
    • https://pabojigu.weebly.com/uploads/1/3/4/8/134862721/be9739d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418972/normal_605b41954a90e.pdfIn PDF document text
    • https://koxubabu.weebly.com/uploads/1/3/4/3/134314291/fudaluxa.pdfIn PDF document text
    • https://muluxebaxomoj.weebly.com/uploads/1/3/5/4/135401331/2415165.pdfIn PDF document text
    • https://zadukali.weebly.com/uploads/1/3/5/3/135340438/vaxuwutiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2d841ef3-a248-4e6a-996b-2d54d6713fdd.filesusr.com/ugd/1decf9_596af2b3b6fb4993a645709cf9f8065c.pdf?index=trueIn PDF document text
    • http://dipumekamerara.rf.gd/15471869539.pdfIn PDF document text
    • http://favekagopu.epizy.com/shinee_good_evening_song_ilkpop.pdfIn PDF document text
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_85620128fcbb49bbb767645e85a9bce1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b39121a-ee72-47d5-a7d4-a4cc3aeef051/mopowiluzoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f3f43e2-27d2-49c6-89fc-3a2491b5cba3/cornerstone_guitar_chords_key_of_g.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ad290de-fcb7-4677-b369-d734db41be27/how_to_disassemble_dyson_dc59_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff8d0035-b44f-4c6f-8544-c7995b8da1c4/kivesilifiwatafi.pdfIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_63218da71e9042a6b64919b06cb942c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/00f4afd0-f661-4fd2-b385-5049621cbc09/is_sql_still_relevant_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d1babcf-13c1-4fe7-a342-44417dd31671/68440959028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d96e5539-5e7b-4d80-8b78-62940f6353c3/38096193419.pdfIn PDF document text
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_45d1cf6679824529aaef4cfe6927accc.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE294 5232 bytes
SHA-256: 3e89d87b208bedc805ea9148c538934e733a88d5ff002f633b3557e50d4c14e2
font_01_sfnt_off0000f47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47F 10944 bytes
SHA-256: 5e0ac80fbda188cbe535305b6fe120269c3bb8b42cb11231e06366d55da110a5
font_02_sfnt_off000119f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F7 16164 bytes
SHA-256: 6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3

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