Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db5f6805f70a8a0…

MALICIOUS

PDF

82.4 KB Created: 2021-05-29 22:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c6df3b64cb696403c167a875cb86395 SHA-1: 267386752132775fc67b3d6e4e3995122e23218d SHA-256: 6db5f6805f70a8a033f355face4c32ec9ea917ac5e133d41a3511fbceda379be
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The primary URL, 'https://kuzutuzo.ru/strik?utm_term=how+to+reset+a+roku+stick+without+remote', suggests a lure to trick users into clicking. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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
  • 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://kuzutuzo.ru/strik?utm_term=how+to+reset+a+roku+stick+without+remote
    • https://cdn-cms.f-static.net/uploads/4426810/normal_606362c6186a9.pdf
    • https://powagexufofuw.weebly.com/uploads/1/3/4/7/134748875/9352955.pdf
    • https://norokeveja.weebly.com/uploads/1/3/4/7/134706326/nesakexufu.pdf
    • https://vozexipazaxa.weebly.com/uploads/1/3/4/4/134444785/4c60260a2.pdf
    • https://lekevemu.weebly.com/uploads/1/3/0/7/130776436/bemumafo.pdf
    • https://wimegipovuxu.weebly.com/uploads/1/3/4/3/134373819/diranagol-jodirarekobe.pdf
    • https://bovoladimuva.weebly.com/uploads/1/3/0/9/130970023/gudexuralonuvokumog.pdf
    • https://dumexegutotopu.weebly.com/uploads/1/3/4/3/134354144/tabipewekumovav-figedizeza-nakuxobir.pdf
    • https://static.s123-cdn-static-d.com/uploads/4495526/normal_60b013a41df10.pdf
    • https://zunijitulizi.weebly.com/uploads/1/3/5/3/135305500/nutifikawamumi.pdf
    • https://rarejiwu.weebly.com/uploads/1/3/1/6/131606055/163576.pdf
    • https://mudizuponiwox.weebly.com/uploads/1/3/2/7/132740987/9370454.pdf
    • https://nuropasidax.weebly.com/uploads/1/3/5/3/135393275/puvejep_nosetemexiwazu_fibojuxitokak_netadurezemuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/7a60292d-df04-4850-b7be-a01861da5743/dead_and_gone_lyrics_twiztid.pdf
    • https://uploads.strikinglycdn.com/files/36a949c3-d7dd-40b8-9b9f-7bff722a7e78/duzoruri.pdf
    • https://uploads.strikinglycdn.com/files/093f0f64-5def-4c21-8701-898949de8bfa/how_to_change_the_filter_on_a_frigidaire_dehumidifier.pdf
    • https://uploads.strikinglycdn.com/files/e8c6a2a5-9b83-4baf-926f-f4d43ca83275/qual_o_sintomas_da_covid_19.pdf
    • https://uploads.strikinglycdn.com/files/84bc32f3-53e6-4e16-a8e5-72ac79379663/43090965343.pdf
    • https://uploads.strikinglycdn.com/files/664fc526-1eef-4af2-92c5-264069767c74/mirro_pressure_cooker_gasket_9882.pdf
    • https://uploads.strikinglycdn.com/files/708403c4-5142-4225-8c26-a12d3b817adb/46233454083.pdf
    • https://uploads.strikinglycdn.com/files/092ef493-33bd-43ec-8689-d6ebcb8ba37e/5_out_motion_offense_villanova.pdf
    • https://uploads.strikinglycdn.com/files/1606d80c-9911-4265-a279-cea13bda8264/zagusoxuxeseset.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5b4.bin
3333d249effc72a31f027f8f21b58dbfc88634a154d0b251c69f6f7434b46e90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B4 4900 bytes
font_01_sfnt_off0001066f.bin
4f8c84174d2298f2166a62682956b18e4c4f98cb96b45c9c4e7b54d30c5757c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1066F 11132 bytes
font_02_sfnt_off00012c1d.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1D 4324 bytes

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