Malicious PDF — malware analysis report

Static analysis result for SHA-256 b142edd713468dbb…

MALICIOUS

PDF

74.4 KB Created: 2021-03-25 20:02:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2adebcc56bc2921b489d4018e6fa5660 SHA-1: 7ab5df577abb5821f9fd428ad045267d0d130890 SHA-256: b142edd713468dbb92f5afcdb8109c8ed9f4fc4956fa9cf12c00b03c4d002b55
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, with a significant number pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains keywords related to financial templates, likely serving as a lure.

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://midufefew.ru/123?utm_term=balloon+payment+excel+template
    • http://hs-life.ru/bomusaxikufutubamudidtez6.pdf
    • https://runeburagaxe.weebly.com/uploads/1/3/4/6/134699488/e33f6db.pdf
    • https://davobudo.weebly.com/uploads/1/3/4/4/134432622/bopar.pdf
    • https://cdn.sqhk.co/naruxibe/0jdjhge/16457340957.pdf
    • http://xtw2.club/thermostat_stc_1000_problem11fuh.pdf
    • http://creditscoretracking.info/mezefodw9u.pdf
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/30636e15.pdf
    • http://cmb-societe.com/android_nougat_7.1.2_featuresgkemw.pdf
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/vewufufakokema.pdf
    • http://betmoy56.com/4678093900lxc98.pdf
    • https://cdn.sqhk.co/vusunuvaka/gchiR4K/quotation_invoice_template_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_7b9018de7d8c4aee9fd0fc900dffb57a.pdf?index=true
    • https://s3.amazonaws.com/tuxalowafokuvo/msi_h81m-_e33_bios_update.pdf
    • https://73099f28-10d5-4558-98a1-2f8dc61f1a2f.filesusr.com/ugd/f62eaa_0603a140c76b4b56a906b3dadc093cfc.pdf?index=true
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_3cb778c711614f59a2c7c42fe09fcd3b.pdf?index=true
    • https://s3.amazonaws.com/jiwotarotavuz/ruwovabozunekusonobinipa.pdf
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_aefb8ba2cd9a45f084323b4c2a1fc5e7.pdf?index=true
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_2a776e1d94234518b8b285db9a401863.pdf?index=true
    • https://s3.amazonaws.com/fezenur/54495851793.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_off0000e750.bin
3a1a580f4d42af6beab3d3ea436facc447e5ac70960f3e6cd84d9a6890c2c33f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE750 5024 bytes
font_01_sfnt_off0000f867.bin
19dc31cc2d31751a2383052679ecb213d2e0c0c74277c77927949937fa6a9840		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF867 10672 bytes

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