Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f15a953da35c6d5…

MALICIOUS

PDF

74.5 KB Created: 2021-03-03 07:53:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63e13dc57a5dcaff002bf64ff3662ce0 SHA-1: a7131689a6b4123609dda8e0d89ae5fca86b929f SHA-256: 9f15a953da35c6d5d14b0a224a092d1c45918c29c3fb159523ca9149cf60a22e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to PDF files hosted on file-sharing services, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the heuristic firings suggest the document is designed to trick users into downloading further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wix?keyword=band+of+brothers+book+pdf+free+download
    • https://nusevusigafub.weebly.com/uploads/1/3/1/3/131398220/f08d7c8c6684f7.pdf
    • http://checkmyscore.info/xesukarexupiluzozg9ex.pdf
    • https://tiwirekofer.weebly.com/uploads/1/3/5/3/135314588/gitafof_fafeki_julakasu_zutikutaga.pdf
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/xivimazekital.pdf
    • https://pagazamis.weebly.com/uploads/1/3/5/3/135310118/5371659.pdf
    • https://xixemoxutosiseg.weebly.com/uploads/1/3/4/4/134473276/vemej.pdf
    • https://wimofitadaxota.weebly.com/uploads/1/3/4/3/134362004/91d5813c84645e5.pdf
    • https://jetabasujupeg.weebly.com/uploads/1/3/4/7/134703241/18701.pdf
    • https://bajixaxazuxu.weebly.com/uploads/1/3/1/3/131383864/xewutexi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lupuvogotog/fda_guidance_adverse_event_reporting_clinical_trials.pdf
    • http://ruwevabebivis.epizy.com/divergent_3_allegiant_2016_movie.pdf
    • http://gozowivafano.rf.gd/sheet_piano_happy_new_year_n_gin.pdf
    • https://s3.amazonaws.com/vavale/boxing_star_equipment_guide.pdf
    • https://s3.amazonaws.com/sigobija/best_business_card_scanner_android.pdf
    • https://s3.amazonaws.com/zasepo/funupujatedetujalujuzup.pdf
    • http://bibuxidon.rf.gd/stencil_acetate_sheets_uk.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e597.bin
3ae94eb0bc460346a4c4ebffd531bf60da3c5c59d55a335ad262ad8e16de8c56
pdf-font-stream PDF embedded font (sfnt) at offset 0xE597 5472 bytes
font_01_sfnt_off0000f83d.bin
d22778c0bc86eccab7ce1604fec41b2f70dbd64288ce0448e8344a3a9139192b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 10988 bytes