Malicious PDF — malware analysis report

Static analysis result for SHA-256 6670cac730f51d85…

MALICIOUS

PDF

71.7 KB Created: 2021-02-23 03:19:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 391a068a338d62c820d1ff56b1ffde99 SHA-1: 0ea5d82685433a104c0d477b6956a0cd1e3259e6 SHA-256: 6670cac730f51d85fab386aa5be22a0f754f250bb94067d74494d47c92ceecbe
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=blood+bowl+2+best+dwarf+skills PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460688/normal_5fcbd6e8cc585.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419001/normal_601493e4ac455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_5fd5f555961e7.pdfIn PDF document text
    • https://gebomatera.weebly.com/uploads/1/3/5/3/135396668/sijusuri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446162/normal_6008360b8f122.pdfIn PDF document text
    • https://xifalazixaxidig.weebly.com/uploads/1/3/0/8/130874217/0293d756a47b.pdfIn PDF document text
    • https://kotezoxeruv.weebly.com/uploads/1/3/5/3/135345651/7cdcaa74f9e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471706/normal_5fef11efeab16.pdfIn PDF document text
    • https://cdn.sqhk.co/pulijidapis/diboChg/nintendo_switch_online_buying.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488807/normal_5feb643e1318e.pdfIn PDF document text
    • https://lazumuron.weebly.com/uploads/1/3/4/8/134863931/bepovodiwoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413373/normal_5fcca79961bac.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/hjiyMEO/best_electric_train_set_for_christmas_tree.pdfIn PDF document text
    • https://cdn.sqhk.co/xebibugekux/ghaqjgs/siegefall_apk_mod.pdfIn PDF document text
    • https://kewidanuratug.weebly.com/uploads/1/3/5/3/135323433/suradusubaxax-gilisoje.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/donake/photoshop_background_hd_effects_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/official_business_letterhead_format.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_off0000d9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F9 5380 bytes
SHA-256: 9a7aed6be9493a73706d64d935bea52449ee9ad22ef2dd966ff28494eca4e5c8
font_01_sfnt_off0000ec68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC68 11188 bytes
SHA-256: 9629c5cb848bc880c54f823f642edda44df1ed82cec2c1b2befb1c97e8c6d7b3

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