Malicious PDF — malware analysis report

Static analysis result for SHA-256 3acc34f647a8a9ff…

MALICIOUS

PDF

78.7 KB Created: 2021-03-24 07:51:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 82186eac36dc217067bc902f57660b5e SHA-1: c0e71ac212aeb26ffbcf2ab94846dde8a18528cc SHA-256: 3acc34f647a8a9ff96b733694489b67cfd36e0a08f01cedc470b929d3f25e057
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting and are used in a link farm pattern. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains metadata related to a sewing machine, which is likely a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://baarspo.ru/strik?utm_term=singer+quantum+stylist+9960+bobbin+issues PDF link annotation
    • http://astropsychology.site/neverwinter_maze_engine_guidekjuca.pdfIn PDF document text
    • http://beautytopshop.site/dolizazupamujuwolatuxet7rr7.pdfIn PDF document text
    • http://denizan.com/eh40_2000_occupational_exposure_limits_2000favjj.pdfIn PDF document text
    • http://topvideo.design/walmart_photo_promo_code_honeyzr1lq.pdfIn PDF document text
    • http://huaweistoreukr.xyz/lokozoxodetawepaloj7j2yk.pdfIn PDF document text
    • http://abreudesigns.com/772566439542vz6s.pdfIn PDF document text
    • http://zarabatyivat.ru/treaty_of_hudaibiya_scribed_bypku59.pdfIn PDF document text
    • http://sberin.xyz/76584834087zyrfj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://najijojovigom.myartsonline.com/chipotle_allergen_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/55776729125.pdfIn PDF document text
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_9d7a8663a04141e4bf7b3eee0f2e8955.pdf?index=trueIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_9a67b9e5812145dda84aa76cccf64bcb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/vunaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88a0ec91-db47-4cdd-99b5-c36329c57bd1/what_is_civil_law_and_criminal_law.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/acerola_cherry_health_benefits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b481f6a6-93a5-4000-859a-7a14cb2f2017/how_much_do_global_marketing_managers_make.pdfIn PDF document text
    • http://jeximojela.myartsonline.com/brevet_2020_sujet_franais.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/mumumevemabufe.pdfIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_b37dfc56d2234bbdafc171672cbd64ab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/26634e21-e97b-4c0b-a148-afbfb7c0f1cc/hp_laserjet_m1212nf_mfp_scanner_drivers.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/fix_cell_google_spreadsheet.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_off0000f445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF445 5928 bytes
SHA-256: 2773ac8b7c5f94f46b5cb114bbcb4d24a3fbf5fa7f979cc0f0b36beb2b6a7ad4
font_01_sfnt_off00010852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10852 10860 bytes
SHA-256: 2f463b201af6e4b7c5e381fd94c2aa21c83fb45cd4281cfec1196fd092016122

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