Malicious PDF — malware analysis report

Static analysis result for SHA-256 681fdb9b3ae8c9c0…

MALICIOUS

PDF

73.5 KB Created: 2021-02-28 14:13:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 41fe5bf509da7fb76300d052ecc88340 SHA-1: 1637b1cad60a60e248534783c93ea8cc8885fcf3 SHA-256: 681fdb9b3ae8c9c076aa0db4d8e7454d9bf4e2af5de46bf6eebf8334e95d8b37
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/award?keyword=second+order+desires+examples PDF link annotation
    • https://lozorodarefela.weebly.com/uploads/1/3/2/6/132681783/3299703.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/hp_laserjet_p2015_new_printer_price_in_pakistan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493200/normal_600b6a99c1d54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392877/normal_6015ac3bd8084.pdfIn PDF document text
    • https://xitupiwe.weebly.com/uploads/1/3/4/4/134489196/4410855.pdfIn PDF document text
    • http://vadosaj.getenjoyment.net/glencoe_geometry_6-3_study_guide_and_intervention_tests_for_parallelograms.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/magapeguwabe/ketopojiziwolibasizop.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/vizosubumogulife.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/nogiruzujeromizamudod.pdfIn PDF document text
    • http://medexode.atwebpages.com/50057583379.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/why_is_my_lorex_system_beeping.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/mizerudelotafimawaxidugi.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/business_information_systems_beynon-_davies.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/18060677312.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/concussion_protocol.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_off0000e432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE432 5388 bytes
SHA-256: a7f4c8f7fbb35834587226fb4afc797d12244005dbb71e6632efbe7a0095dfd5
font_01_sfnt_off0000f670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF670 10160 bytes
SHA-256: 3e55cbe80a453d093c1fc3a408373835405f9bafb09a24694b6062c11ee9e67c