Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb286ab11693a766…

MALICIOUS

PDF

71.9 KB Created: 2021-02-26 14:17:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c72f32b15731c543fbe4f6404a1ecc79 SHA-1: c53593697b3321fdeacb1a8ec934b1311e2e088b SHA-256: fb286ab11693a76689260a5112b20efa8f828df3922640fcb28ce7fad222ea98
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/award?keyword=how+to+change+schlage+keyless+entry PDF link annotation
    • http://kutatit.getenjoyment.net/norcold_refrigerator_replacement_chart.pdfIn PDF document text
    • https://batigagonu.weebly.com/uploads/1/3/4/7/134774980/179576.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/yD4Fhbt/shooting_game_spaceship.pdfIn PDF document text
    • http://newuwedeza.mypressonline.com/how_to_acrylic_paint_galaxy.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikebepo/eVNhbji/cartoon_anime_color_by_number_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/tememagitapo/Wgc3jhs/dj_sirens_sound_effects_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/melivetipi/aHeVrdI/wefikav.pdfIn PDF document text
    • http://xilexevu.scienceontheweb.net/what_can_kill_a_wild_boar.pdfIn PDF document text
    • https://cdn.sqhk.co/jivumigen/3uhhgjh/candy_crush_friends_saga_download_uptodown.pdfIn PDF document text
    • http://twitter-center.com/aaron_furniture_rental_storer6zo3.pdfIn PDF document text
    • https://gopadafuwidu.weebly.com/uploads/1/3/0/7/130740623/bbd48.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/nukizo.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/how_to_crochet_a_hat_for_a_baby_boy.pdfIn PDF document text
    • https://tivufotevomok.weebly.com/uploads/1/3/2/6/132682035/7431762.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/cpjhhhr/mupojamesakitosime.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dowuvoduwitovos.atwebpages.com/83480559360.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_off0000dd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3D 5280 bytes
SHA-256: 7d71603b5bfa00fec8f2ed4eb0aef668c46378bf61e7ac270d5dbddf478f8828
font_01_sfnt_off0000ef47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF47 10380 bytes
SHA-256: 1613412a167f36857f4c7e7dfad1cc1d48de15faa158e24b813ab9c79b639a9e

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