Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1ddbd87b3d3b9c…

MALICIOUS

PDF

75.9 KB Created: 2021-03-03 02:40:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8e7446946841932366f03c3828247a67 SHA-1: ec81d943d654439c589212c6f260e31a9d028808 SHA-256: 7f1ddbd87b3d3b9cb138db5e4c1a4c11c5bed5ec19ba6cba2e451570531a4a78
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://crophysi.ru/strik?utm_term=the+whipping+boy+movie+trailer PDF link annotation
    • http://wasukowoko.iblogger.org/how_to_develop_your_self_confidence.pdfIn PDF document text
    • http://inostrana.com/dupalebuzagisapopujirh3cu1.pdfIn PDF document text
    • http://lemiritafuwab.22web.org/platform_bed_queen_solid_wood.pdfIn PDF document text
    • https://datevasipagudi.weebly.com/uploads/1/3/0/8/130874205/9634695.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/6382113429.pdfIn PDF document text
    • https://meligobuv.weebly.com/uploads/1/3/1/0/131070858/gumizutisafig.pdfIn PDF document text
    • http://appless.space/95221865042p72a1.pdfIn PDF document text
    • http://mamafiposorugul.sportsontheweb.net/bushmaster_xm15-e2s_lower.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/murudute/79378945189.pdfIn PDF document text
    • http://vuwadiwotaja.rf.gd/77868397277.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/sistem_informasi_akademik._unsoed._ac._id.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/pisinodu.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/c_form_verification_chandigarh.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/shoei_neotec_2_visor_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/factorising_gcse_exam_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/95585605813.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/que_come_oso_de_anteojos.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_off0000e8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AD 5396 bytes
SHA-256: b346f0a6016be226a268e2d0865679a178ed2c8df8927fb3088f91cdf103eecd
font_01_sfnt_off0000fafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFB 11164 bytes
SHA-256: 109432b0e522b4894248a846f58b381caf77e01114b969cb7ead0167e2dd9523

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