Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f2762e8357ef947…

MALICIOUS

PDF

122.3 KB Created: 2021-03-28 20:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8a840554400a28566acbf87bfa73633d SHA-1: 6bb6efa96104b8d7fcbed09351a7631ad39b1f74 SHA-256: 1f2762e8357ef9472a1266d753159512b8362ba2378dd8cda58cbda005b4d395
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a potential link farm. One of the embedded URIs, 'https://zajinet.ru/wix?keyword=four+letter+adjectives+starting+with+l', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse.

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 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.
  • 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://zajinet.ru/wix?keyword=four+letter+adjectives+starting+with+l PDF link annotation
    • http://lozuzaragujeb.mypressonline.com/how_to_crochet_a_square_in_round.pdfIn PDF document text
    • http://sifinujox.sportsontheweb.net/56126692995.pdfIn PDF document text
    • https://pimotaro.weebly.com/uploads/1/3/3/9/133986821/jesulamoretanuwod.pdfIn PDF document text
    • https://zademufexek.weebly.com/uploads/1/3/4/7/134765537/bidiragu-garifo-zidunabudireru.pdfIn PDF document text
    • http://ralugugifoxatir.scienceontheweb.net/graco_snugride_30_expiry_date_canada.pdfIn PDF document text
    • https://bomuwokobija.weebly.com/uploads/1/3/4/0/134041081/90b4fe0dfb.pdfIn PDF document text
    • https://satizivuzaked.weebly.com/uploads/1/3/4/3/134383512/puxupigaw_gixebujewis_siroseko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vuxagixil/whats_coming_to_netflix_in_may_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/nigisulujojotobav.pdfIn PDF document text
    • http://valupakukav.myartsonline.com/55401591183.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/datokufekasal.pdfIn PDF document text
    • http://febarufowit.epizy.com/bade_achhe_lagte_hai_episode_150.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/apple_music_keeps_stopping_android_2019.pdfIn PDF document text
    • http://limufij.myartsonline.com/65280548317.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/zutusevaxawavosegewa.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/google_chrome_os_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/causes_of_excessive_gas_formation_in_abdomen.pdfIn PDF document text
    • http://dewabop.rf.gd/cccam_to_oscam_converter_1._2.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/xujoxuraxej.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/superdry_ladies_jacket_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/59572646289.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19803 5268 bytes
SHA-256: e89baaf084ab84ed6783d5d3646435b462d56f5729197ffd1aa04f5e3325a2ec
font_01_sfnt_off0001aa06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA06 10596 bytes
SHA-256: d53ab1c789ca49d33720fb09b09bf4ba075de3fc721dae111e0badfd40776e12
font_02_sfnt_off0001ce0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE0B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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