Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0686f6bbfc10855…

MALICIOUS

PDF

77.3 KB Created: 2021-04-29 23:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d7f6c613609e8ec4c05c6eab66c26734 SHA-1: b0725a0f9881feb00be2307348b1eb22f6fd38da SHA-256: c0686f6bbfc10855be342bca01bfdad45bcec79729a55c6892030249ad5c3b6d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. One URL, https://nipisod.ru/strik?utm_term=safety+1st+grow+and+go+3-in-1+car+seat+review, appears to be a primary target for user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://nipisod.ru/strik?utm_term=safety+1st+grow+and+go+3-in-1+car+seat+review PDF link annotation
    • http://afracheat2.xyz/60153543724lmck3.pdfIn PDF document text
    • http://usechambre.xyz/before_anna_todd_movievvmmk.pdfIn PDF document text
    • http://fitokapss.xyz/how_to_configure_picostation_m2xw2cj.pdfIn PDF document text
    • http://shoplus.info/vivawudijelagudfp3un.pdfIn PDF document text
    • http://zitekimuzefovar.iblogger.org/jogawowuwajozipuxomow.pdfIn PDF document text
    • https://bazigumaxofiz.weebly.com/uploads/1/3/5/3/135383162/deac9ad2e848e.pdfIn PDF document text
    • http://vasamekekegu.iblogger.org/beautiful_nubia_all_songs.pdfIn PDF document text
    • http://sluzhba1.net/how_do_you_use_soap_in_greenworks_pressure_washer0vs8d.pdfIn PDF document text
    • http://solent.bar/blackberry_torch_9860_flash_fileeohpp.pdfIn PDF document text
    • https://nowuvufeguxebib.weebly.com/uploads/1/3/2/8/132814980/kunikuvividolixokepa.pdfIn PDF document text
    • http://you-bestshop.xyz/5294455840jv1qo.pdfIn PDF document text
    • http://myirn.icu/6230715746459fwx.pdfIn PDF document text
    • http://arenaprobet.com/dazozowuxajqyvly.pdfIn PDF document text
    • http://bigtittybella.com/32071041616a6ww2.pdfIn PDF document text
    • https://dexulana.weebly.com/uploads/1/3/4/2/134234773/1730724.pdfIn PDF document text
    • http://erkutungotu.com/el_nombre_de_jesus_gilberto_peguero_lyricsm2bfh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f56bc68-e543-4a23-8c47-6a91857b4917/roasted_ham_temperature.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5bd8e9c-8593-4d11-99fe-0545b9c8f904/kasuxomemubelafijupu.pdfIn PDF document text
    • http://tokupan.rf.gd/10330577503.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ecc1da7-f348-47b7-baa0-f5a8cc5b0565/53619209271.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14F 5760 bytes
SHA-256: f8ff891cf0bf7189eb9070344782379028b216c5d0dc8fc0b932fd70282f3180
font_01_sfnt_off00010533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10533 10100 bytes
SHA-256: e79cbfd1b632a7234b3c69b7ebe2db62f12105391e7bd0c8ae699acbb4686194

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