Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ef5952a32d4b04…

MALICIOUS

PDF

66.2 KB Created: 2021-01-10 06:32:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c615fc6080234a05ccf61a81390b6335 SHA-1: 9217b0e4090ff3577206f5b41e1655952bf5353c SHA-256: 82ef5952a32d4b0444a008d126b6ce739940eb6e032d4180e946dd7ad7e1a474
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, contains text related to a 'birthday card' and the wkhtmltopdf application, suggesting a lure. The presence of many external links indicates an attempt to redirect the user to potentially malicious sites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=happy+birthday+stephanie+card PDF link annotation
    • https://site-1168202.mozfiles.com/files/1168202/acrobat_professional_11__0_mlp_aoo_full.pdfIn PDF document text
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/kekibukima-tevowazenugipor.pdfIn PDF document text
    • https://site-1216718.mozfiles.com/files/1216718/ethnographic_essay_template.pdfIn PDF document text
    • https://xinagele.weebly.com/uploads/1/3/4/7/134729321/daxavutoxax_rajaxogufuvoj_wumogapopo.pdfIn PDF document text
    • https://mipurokuniveg.weebly.com/uploads/1/3/4/5/134508865/wufunavux-zagolazu-bagapok.pdfIn PDF document text
    • https://ladetizor.weebly.com/uploads/1/3/4/7/134731735/misobaborojij_kodinotovazuj_maberojewib_gigilugiwafi.pdfIn PDF document text
    • https://barobinamad.weebly.com/uploads/1/3/4/7/134756413/fajufiso.pdfIn PDF document text
    • https://site-1176655.mozfiles.com/files/1176655/76380315300.pdfIn PDF document text
    • https://gajitiromivalot.weebly.com/uploads/1/3/4/4/134475956/semavewiwarege.pdfIn PDF document text
    • https://vadurijale.weebly.com/uploads/1/3/4/5/134590900/5667820.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/fofeguj/luzudezutiluxofawifide.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/number_theory_theorems.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/kokagepavilepa.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/41729772582.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_off0000c6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E1 5332 bytes
SHA-256: b16e8713f8507fa0e95916ef47e5474e4db06500f05ecbd264e414a4b96b4207
font_01_sfnt_off0000d8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F7 10372 bytes
SHA-256: c7c0500d8cbe389df225b56442df3b0b55b501d926caa66008ccbb643d06a89e

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