Malicious PDF — malware analysis report

Static analysis result for SHA-256 840dfa04b8360c3b…

MALICIOUS

PDF

74.8 KB Created: 2021-03-10 00:52:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d458c3781b9d8298dd3a0b518450f2c7 SHA-1: e2575548e87ed3003a8db469495c74693fe09c3b SHA-256: 840dfa04b8360c3b35ec4644acbc47ecd35a0384cbfd27afc4911a55769d36ff
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL that appears to be part of a phishing lure related to game answers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://soxebez.ru/aws?utm_term=4+pics+1+word+answers+5+letters+cat
    • https://tefegepivovopuf.weebly.com/uploads/1/3/5/3/135311357/334403.pdf
    • http://tekeriset.iblogger.org/the_real_christmas_book_free.pdf
    • https://gazezujebek.weebly.com/uploads/1/3/4/8/134881616/e82deac19c6d.pdf
    • https://suvedezu.weebly.com/uploads/1/3/1/3/131379937/d4dfc0a3.pdf
    • http://favuloxodi.iblogger.org/68181182209.pdf
    • http://boputev.66ghz.com/prescribing_guidelines_ireland.pdf
    • https://dujomujur.weebly.com/uploads/1/3/4/8/134883281/ziwivavekebesul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bevarolimesale/photosynthesis_and_cellular_respiration_foldable_answers.pdf
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_a072703baae54a23a66f8b8df2471563.pdf?index=true
    • https://s3.amazonaws.com/juwofuxufijup/amazon_sql_interview_questions_and_answers.pdf
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_eb0dc805f39444cd9aa956960f96c3e3.pdf?index=true
    • http://wiwazisumi.rf.gd/how_to_find_a_google_classroom_class_code.pdf
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_0b637d250b974f7cb3ce586faca80230.pdf?index=true
    • http://raguguk.epizy.com/4097706932.pdf
    • http://fidobagasamos.epizy.com/gugutofusalexetafukil.pdf
    • https://s3.amazonaws.com/vukumesoj/cbitss_full_form.pdf
    • http://davivozerab.rf.gd/fajugorefasifukubagofose.pdf
    • https://s3.amazonaws.com/zoluwivebiro/fozojududupexogimigasifo.pdf
    • https://s3.amazonaws.com/vuzufexarevima/mandarin_audio_bible_free.pdf
    • http://tiginusoxer.rf.gd/download_windows_powershell_help_file_name.pdf
    • http://tujufevowupise.epizy.com/zajovuzutulenefigopo.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_off0000e796.bin
e96e306eba4cce19e55988738ff0cc49fa24f24256c0648f59fbe937ce74fe63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE796 5328 bytes
font_01_sfnt_off0000f9e1.bin
075d4793a54e9bd52fbc0a0c269fc0ccc428864b1b75b6ddd76cf8bbb84dd197		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 10528 bytes

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