Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b4f0b1daa9d030…

MALICIOUS

PDF

66.0 KB Created: 2021-03-23 20:57:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e9e81c396180812b3340c15dc52c5f2 SHA-1: edfd970ff9244a91c28d075d28b8b7993f2d3df8 SHA-256: 70b4f0b1daa9d0306937847d2733629b39f54d8372a588da9a6a6b44bdee38b6
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to printer test pages, likely to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=how+to+print+test+page+hp+deskjet+2545
    • https://cdn-cms.f-static.net/uploads/4495681/normal_602e828313cac.pdf
    • https://cdn-cms.f-static.net/uploads/4490725/normal_6012dc0cbeebe.pdf
    • https://jizotigop.weebly.com/uploads/1/3/0/8/130874082/6487121.pdf
    • https://cdn.sqhk.co/nemizuxe/d56ohcW/translate_google_sheets.pdf
    • https://setunifajufin.weebly.com/uploads/1/3/5/9/135989633/nabirabejofewaxigise.pdf
    • https://static.s123-cdn-static.com/uploads/4476427/normal_5fc95fd345502.pdf
    • http://idealica-co.site/zedozepuiv7tk.pdf
    • https://cdn.sqhk.co/fezodasesil/Aifijih/sydney_lyric_theatre_seating_guide.pdf
    • https://cdn-cms.f-static.net/uploads/4485001/normal_6059af4a3de0d.pdf
    • http://wegansit.space/unique_happy_new_year_2020_gif2i8h3.pdf
    • http://iminn.ru/kifatodonoveletodonasu4kl.pdf
    • https://cdn.sqhk.co/fularulojoze/aggQnii/best_oatmeal_chocolate_chip_cookies_simply_recipes.pdf
    • https://dejaxunex.weebly.com/uploads/1/3/4/3/134318563/lobep.pdf
    • http://playmarket-online.com/dedimewinivapobot92sv2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_aead8226685346888fb96c6dba89c1ec.pdf?index=true
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_a7746b3ccde44cda88d96029d6c351c1.pdf?index=true
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_10e7719cd85241d69fc77557a8651322.pdf?index=true
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_b65ce4c90c5f406ba70c44f56651f73b.pdf?index=true
    • 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_off0000c68b.bin
e8698f0f1ee813473152eff1d2cbef7d59d918a2ccf663db95df2cbe68648076		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC68B 5724 bytes
font_01_sfnt_off0000da20.bin
d3ad0cc0d3bad1b3950f21c1d67803040f9a9ada3f2734f2e84ddfc2dc29576b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA20 9692 bytes

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