Malicious PDF — malware analysis report

Static analysis result for SHA-256 d63a578157b9854e…

MALICIOUS

PDF

82.4 KB Created: 2021-05-02 00:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1935c774cfabea46cf178fc4789c70e SHA-1: ec51d66d2622518660294046b8ec64ec3c23ba59 SHA-256: d63a578157b9854e1cc892dee04524633ce4bc8b540369a1d4789eaf7f10a68d
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score support the classification as malicious. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • 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://xajibur.ru/strik?utm_term=how+to+achieve+iso+9001+certification
    • http://aazzzry.space/60480054013oug1n.pdf
    • https://gimuloge.weebly.com/uploads/1/3/0/7/130775506/e958eba4.pdf
    • https://cdn.sqhk.co/nivunufozub/MrEighb/zupelijanuxedowinaxon.pdf
    • https://fatanavaxiwakat.weebly.com/uploads/1/3/4/6/134606547/ligokix-gifajosozatejum.pdf
    • http://derilezin.sportsontheweb.net/annona_muricata_anticancer.pdf
    • http://gakukuketisalum.scienceontheweb.net/16256387680.pdf
    • https://cdn.sqhk.co/desogepupema/hiih4gj/latest_ringtones_2020_zedge.pdf
    • http://copyrightsupporthelpcenter.com/vopojuwibelajojudopivotuwyzex8.pdf
    • https://bopidojosonek.weebly.com/uploads/1/3/1/3/131384153/nezipuwibigugip-sizifopatas-sokuf-fatagupano.pdf
    • https://vetitigozep.weebly.com/uploads/1/3/1/4/131437709/4789860.pdf
    • http://smartcreditus.info/baixar_driver_hp_deskjet_f2430qo5da.pdf
    • https://cdn.sqhk.co/manaruparil/tiejclh/sitelumeset.pdf
    • http://astrology-personal.online/xipimixujosisopenle7k.pdf
    • http://mnclassis.org/420753312554xvjq.pdf
    • http://zugemenelil.medianewsonline.com/vebupaliviz.pdf
    • https://cdn.sqhk.co/jigixomavola/iSB7Rhd/webtoon_promo_codes_2020_august.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xuvekixofeku.onlinewebshop.net/blue_ribbon_foods_prices.pdf
    • https://d7179dab-c972-4501-9f4a-16044ca71e84.filesusr.com/ugd/434f74_29eb23daa6d7498891589280479d9717.pdf?index=true
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_78b8ae3ffcbe4559b5c0e499f98f5b15.pdf?index=true
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_98216e9dd53e452883be8fdf2eeecf34.pdf?index=true
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_d46a4a831ed040bba607429f46c0403e.pdf?index=true
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_a3424cbd42e24d33b407618ac20a02e7.pdf?index=true
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_1c2b66f592464fa0b756ed9e358e94f0.pdf?index=true
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_4869cd7c38014a028fac514c979371ea.pdf?index=true
    • http://nitubak.atwebpages.com/beatles_blackbird_piano.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_off0001042d.bin
3c9d0ff9ec982ee8b6fdb40242e138b69062527011f31297b84be82e814232bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1042D 5400 bytes
font_01_sfnt_off0001169e.bin
c70e3464893f1d39c787bfcc44be1368b110cb7efcdf8fbf39dcc26447ffd5f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1169E 11028 bytes

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