Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ed67d84bcaebf8…

MALICIOUS

PDF

79.7 KB Created: 2021-04-03 22:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c7524422ee93574b8a32025267b5c94 SHA-1: 242191c91175b4602fbd8604a5f7549079850f63 SHA-256: a5ed67d84bcaebf89779229d6f68d5722e18872ceb81a037bd58a52adc732004
186 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 high likelihood of malicious intent. It contains a large number of external links, many of which point to disposable domains, suggesting it is part of an SEO spam or phishing campaign. The embedded URL https://jottigo.ru/strik?utm_term=olive+oil+chemical+components is a primary indicator of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://jottigo.ru/strik?utm_term=olive+oil+chemical+components
    • https://xananitape.weebly.com/uploads/1/3/4/0/134095977/9668343.pdf
    • http://sovuradema.medianewsonline.com/97332686066.pdf
    • https://donigulajerilag.weebly.com/uploads/1/3/0/8/130874297/dajinimofibipex-tipexupibawepi.pdf
    • http://pawusewi.sportsontheweb.net/boris_akunin_the_winter_queen.pdf
    • http://wikowezenitezo.medianewsonline.com/cm_van_den_heever_laat_vrugte.pdf
    • http://lakuberik.mywebcommunity.org/afficheur_lcd_4x20.pdf
    • http://vivekawiga.sportsontheweb.net/jisikupunudoxomovuxiv.pdf
    • http://dusikazo.mypressonline.com/around_the_world_in_eighty_days_character_analysis.pdf
    • https://kewisivi.weebly.com/uploads/1/3/2/6/132681156/33bffa2.pdf
    • http://wejafopag.mypressonline.com/bogefukumovosowumope.pdf
    • https://nusiteraj.weebly.com/uploads/1/3/5/3/135347212/gawifizixivigo-golunaka-juwedok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_ed51825e78a643e9901128890c412d07.pdf?index=true
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_3f3c062ec6ae4a488035ea1b06965e63.pdf?index=true
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_06e183b3b0924cb9a1560595cfd8985a.pdf?index=true
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_48f1821e33fd42608f5b07c54d955f43.pdf?index=true
    • https://s3.amazonaws.com/wovugi/structural_steel_inspection_report_template.pdf
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_a5c62e73981d4dad8067f26a00c24e3a.pdf?index=true
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_cf105b8980a84d05ad7283f919c39edc.pdf?index=true
    • https://s3.amazonaws.com/palevijuj/action_hollywood_movies_2018.pdf
    • https://a181bb3e-7445-4f1f-a1cf-b2fe66c13e92.filesusr.com/ugd/91ce54_c7dcea700ebd424e970789f33562e1c1.pdf?index=true
    • https://s3.amazonaws.com/xefejevife/josepuwofati.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_off0000fbdd.bin
f2b3f8aeacc21c3542d82056c21abc452c2c6dd35f619a052c91497b75b3c314		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDD 5164 bytes
font_01_sfnt_off00010d4b.bin
9fc3b05900581e77d9f275f3bd1b49070d204150810b25edc10f97003d3c2f54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4B 10668 bytes

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