Malicious PDF — malware analysis report

Static analysis result for SHA-256 708c2fe54e68c2c6…

MALICIOUS

PDF

73.2 KB Created: 2021-03-29 19:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 32fba7530a45156d967b136123249719 SHA-1: c02e0223f72df73adaeb18276cfeffa4acf91bab SHA-256: 708c2fe54e68c2c6cb76df65b6a942f54d07d05cee71ccc1897a9e62ad0f7287
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links to malicious redirector infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, suggests a lure related to a 'Revelian cognitive ability test'. The presence of numerous external PDF links, as flagged by 'PDF_SEO_LINK_FARM', further indicates a campaign to distribute malicious content or phish for information. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-10044375-0'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=revelian+cognitive+ability+test+pdf In PDF document text
    • https://jowatoziji.weebly.com/uploads/1/3/4/8/134893097/5726462.pdfIn PDF document text
    • https://sidilatadafexu.weebly.com/uploads/1/3/1/1/131164021/fufukage_muxasel_vugezodiparo.pdfIn PDF document text
    • http://zugobopepoj.sportsontheweb.net/confidence_power_plus_treadmill_pink.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374710/normal_5fcc8af5f41f8.pdfIn PDF document text
    • http://vozobatenaw.mywebcommunity.org/beating_the_street_peter_lynch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473919/normal_601255e617262.pdfIn PDF document text
    • https://pexasojurez.weebly.com/uploads/1/3/1/3/131381046/bizafomusim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445555/normal_6007bb2906024.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/27713120671.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/98574168108.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/29421174360.pdfIn PDF document text
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_bd10817240d0475799a7b098426e0c67.pdf?index=trueIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_a5ef7f1d21f944e38fe03584074747e6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pidufozu/how_much_discount_do_apple_employees_get_on_apple_watch.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/new_hd_bollywood_movies_free_2019.pdfIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_334b6aacf045420c8af40ffcaa890044.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/21543224340.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/vikizumeg.pdfIn PDF document text
    • http://fidegaf.atwebpages.com/pdf_split_merge_mac_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/66427536170.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/kasamiva.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_off0000dfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC2 5536 bytes
SHA-256: 00194ad03b9c498aad12c77bde205a81230d19e787deffa87e1dc627c16f55a8
font_01_sfnt_off0000f2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 10612 bytes
SHA-256: 4ace5b36f6203fd05a230033df42e7882b7e5124a6468408f81e738b2fd67e3b

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