Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a1c16b4462b6b5…

MALICIOUS

PDF

74.6 KB Created: 2021-03-23 23:53:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fc5e5a0d56aa5015e67da7025b40f8fa SHA-1: 2607ff75d095b6f1a72cb4a0376703ca6cf05c2d SHA-256: c5a1c16b4462b6b5f02958aa39bef5bb1dc8145ab2cb5f751b4598208eed908a
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary malicious URL identified is https://jumiwimov.ru/strik?utm_term=does+dyson+do+black+friday+sales, which is likely used to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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 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.
  • 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://jumiwimov.ru/strik?utm_term=does+dyson+do+black+friday+sales PDF link annotation
    • https://zirilomeme.weebly.com/uploads/1/3/6/0/136025267/840823.pdfIn PDF document text
    • http://bikelumonekodex.mygamesonline.org/86306711682.pdfIn PDF document text
    • https://cdn.sqhk.co/zuronenom/joRpjhv/paposofijebugek.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/3hejtj1/bloons_tower_defence_5_hard_strategy.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/ejbjdjg/is_64_bit_os_faster_than_32.pdfIn PDF document text
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/dupepexojesiwe.pdfIn PDF document text
    • https://cdn.sqhk.co/torevebeti/ijapsjg/music_with_lyrics_for_karaoke.pdfIn PDF document text
    • http://pumaguli.scienceontheweb.net/92141253484.pdfIn PDF document text
    • https://sawuwirepugasup.weebly.com/uploads/1/3/0/9/130969548/10464b7.pdfIn PDF document text
    • https://cdn.sqhk.co/tatonabufule/hhdkVNJ/block_sites_android_firefox.pdfIn PDF document text
    • https://bixirugabo.weebly.com/uploads/1/3/0/9/130969405/4464468.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a19d597f-2220-41b3-9459-688249e8a20b.filesusr.com/ugd/f19f53_b385436193014ab4b96e4780f9d20127.pdf?index=trueIn PDF document text
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_e1d456b83e1f4bee822c536e0a4690ff.pdf?index=trueIn PDF document text
    • http://nununad.myartsonline.com/10414543401.pdfIn PDF document text
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_8f7a3cd241d64dd69451312d323755d8.pdf?index=trueIn PDF document text
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_06f7083b52c945febe23dfcc48823a28.pdf?index=trueIn PDF document text
    • http://sadoboxijowem.myartsonline.com/15875276366.pdfIn PDF document text
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_2ea09614b8c846ed88e4cd9818de4e97.pdf?index=trueIn 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_off0000e6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FB 5320 bytes
SHA-256: 8a3e4f83aedee31fd245abe8c1005d93633a57595f98df23cd6ce44e071f6af3
font_01_sfnt_off0000f933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF933 10644 bytes
SHA-256: d3b2afd9365fd7413dadd0bea42c599b75f57cbe5c7bc7f485b9a5d5cdf9e17d

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