Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c4be5f059db910…

MALICIOUS

PDF

82.0 KB Created: 2021-03-03 19:14:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6118329cc813183e195354dd8019e719 SHA-1: e12fe907efb83e75fc0983e7f8f0396eea208e3d SHA-256: 19c4be5f059db910327005ec0b45ad6216e58df3c9725a260225f6e27bf5cc78
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary focus on directing users to `https://baarspo.ru/123?utm_term=what+does+seeing+spiders+in+your+dreams+mean`, disguised as a dream interpretation search result. The PDF also functions as a link farm, hosting many other PDFs on disposable domains, suggesting a broader campaign to distribute 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://baarspo.ru/123?utm_term=what+does+seeing+spiders+in+your+dreams+mean PDF link annotation
    • http://bibuzikufaje.mygamesonline.org/33781123470.pdfIn PDF document text
    • https://zizipidefogin.weebly.com/uploads/1/3/4/8/134852386/a9ae1f55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444374/normal_6033abcdddfd5.pdfIn PDF document text
    • http://jujasoje.iblogger.org/is_55_inch_4k_tv_worth_it.pdfIn PDF document text
    • http://dk-inc.xyz/mercury_25_hp_2_stroke_for_saledkc92.pdfIn PDF document text
    • http://dewiwusuxutez.iblogger.org/54087716475.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/recarga_facil_vivo_numerol5rby.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489846/normal_60270c81cbff9.pdfIn PDF document text
    • http://dihtyar.online/education_board_2019_marksheetltr6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405419/normal_5fe309c24312a.pdfIn PDF document text
    • http://christmas-gift.ru/android_16_and_17_dokkan35udz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369512/normal_5fd7cb0f19b4c.pdfIn PDF document text
    • http://feludekinopotas.scienceontheweb.net/98586919163.pdfIn PDF document text
    • http://arenda-comp.space/15969501257j0tu8.pdfIn PDF document text
    • http://help-service-support.com/11330485044le54v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dokudaruriwiv.atwebpages.com/berklee_jazz_guitar_book.pdfIn PDF document text
    • http://pazugovaru.rf.gd/polaris_360_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F2 5340 bytes
SHA-256: 2ab7be40b785bc8d71af872d53d1fed18379dd1fc874cd7fe2c13d15fffce5cd
font_01_sfnt_off000108fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FC 10484 bytes
SHA-256: 27446c5c8a31143b1e9e09e0d59929d5b15beb1784211594cfab222d87932934
font_02_sfnt_off00012ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA9 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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