Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a634113397110df…

MALICIOUS

PDF

68.3 KB Created: 2020-12-04 23:30:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: fb41b793a7662c4e8fe52481715cfc19 SHA-1: 75b2e541db43df8e4b80539849059bad7365568b SHA-256: 2a634113397110dff7c042715f3728c05ae163879dd9cccfbd34fad915770d11
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'Architecture app for android mobile', suggesting a lure to disguise the malicious links.

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
  • 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://traffking.ru/aws?utm_term=architecture+app+for+android+mobile In PDF document text
    • https://novebeze.weebly.com/uploads/1/3/3/9/133997241/gulaxipedut.pdfIn PDF document text
    • https://vobuzotoxat.weebly.com/uploads/1/3/4/7/134705481/692272febefaf.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/a3f3bf0f-fd36-486a-be5d-462e7fb1d8d7/statistical_sleuth_3rd_edition_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d7dc3dfdd95b60d4c91c/t/5fc17a60e6d49a06bbca8651/1606515299105/zekilosomamigigipep.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/kalabhairava_ashtakam_ringtone_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/24543498676.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/zugilovofozak.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/unblocked_game_66_77.pdfIn PDF document text
    • https://s3.amazonaws.com/rotafasaniz/videneluwimibo.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/rise_of_kingdoms_hermann_talent_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cd6d756-08d1-42ee-b403-40b59593fe3a/xepubofoxurazeti.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_off0000cf3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3A 5348 bytes
SHA-256: 1539cd7583bae0a8978923fbb9c3e74adfd0336cea84ac5e28eaeb6b211234ec
font_01_sfnt_off0000e13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13C 10372 bytes
SHA-256: 32c459ef7277d02c8b55f34e4dd3cd6de4faab32aa89c1ff0f9232441d7733be

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