Malicious PDF — malware analysis report

Static analysis result for SHA-256 af138b47cfb8e52f…

MALICIOUS

PDF

69.7 KB Created: 2020-11-14 10:07:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 47439b7d25d4f0d689cc013fbfe4e80c SHA-1: baf83d24f38e3415e4939a0f45df7175fa5d827e SHA-256: af138b47cfb8e52f1db1049b624b060e675a9471ae296f351c8cda7fbca08d7b
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains strings related to 'aggiornamento android tablet mediacom' and 'wkhtmltopdf', suggesting a lure to trick users into clicking malicious links disguised as software updates.

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://traffmen.ru/aws?utm_term=aggiornamento+android+tablet+mediacom In PDF document text
    • https://xevubevisebu.weebly.com/uploads/1/3/4/7/134754503/rukitibup_baxutedosovurej.pdfIn PDF document text
    • https://bujugumaxu.weebly.com/uploads/1/3/4/0/134096797/josusifomomebir-videkezopupa.pdfIn PDF document text
    • https://jaserasozupog.weebly.com/uploads/1/3/1/4/131454215/gefudigoramoju.pdfIn PDF document text
    • https://lolijejolo.weebly.com/uploads/1/3/4/4/134442146/povupowa.pdfIn PDF document text
    • https://paduzegisenulun.weebly.com/uploads/1/3/4/6/134665595/dced10.pdfIn PDF document text
    • https://zegokovoni.weebly.com/uploads/1/3/4/3/134323662/7885873.pdfIn PDF document text
    • https://lorebigida.weebly.com/uploads/1/3/4/3/134377432/1393803.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/watajive/timisi.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/rice_burner_apk_download.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/tavudadipabirofin.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/18526812569.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/warband_character_creation_guide.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_off0000d621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD621 5212 bytes
SHA-256: 720b89bb4fcc7668f3a87ac3f82d44ff9493241262c055090421515b1a793dbe
font_01_sfnt_off0000e7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BF 10100 bytes
SHA-256: 21f17e7c81315bbf087984b63f6299e353b68c44712457c6bd481911f9f216c5

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