Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd110f948d779d73…

MALICIOUS

PDF

80.8 KB Created: 2021-02-23 11:44:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: eb93ebdb22df78ff39293b639064fbfb SHA-1: 4146c39e134e438da600eddb5246f182413e6bd5 SHA-256: fd110f948d779d73585a5419940eba221852ca79542cfcf42598e40acf4de108
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirector infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to be a lure related to 'critical values of z', likely intended to trick users into clicking the malicious links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=table+of+critical+values+of+z In PDF document text
    • https://cdn.sqhk.co/sebutarukaw/JgfCsii/91895543312.pdfIn PDF document text
    • http://likododolokopaj.iblogger.org/97131957387.pdfIn PDF document text
    • https://cdn.sqhk.co/sifapudoxig/eoohhSP/shelter_in_place_san_francisco_september_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485718/normal_5fe6f9ed9de25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413368/normal_5ff578865a390.pdfIn PDF document text
    • http://eslivdrug.space/41710994241tb4o7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471513/normal_60210503f1b2d.pdfIn PDF document text
    • https://wuwotozon.weebly.com/uploads/1/3/4/3/134315251/werironos-moduzizi-wuguvavo-luxiwotefekorak.pdfIn PDF document text
    • http://makeyourself.xyz/how_to_change_oil_on_toro_6.5_mower4dft3.pdfIn PDF document text
    • https://wipikiriku.weebly.com/uploads/1/3/4/6/134696444/76803bb.pdfIn PDF document text
    • http://nefuwumimo.iblogger.org/guided_sleep_meditation_by_lina_grace.pdfIn PDF document text
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/8150206.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389604/normal_5fec96fe2e44c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mijekobafenado.rf.gd/38952524696.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_off0000fbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF2 5072 bytes
SHA-256: 3023032801f47572fbb336a22465583ecce0e5c62a857595eb703cd06a91d8e4
font_01_sfnt_off00010d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D53 12076 bytes
SHA-256: 99736bff88369c5a1f5e1163496ef40624c57fcb0e3d1623901cda9ea85fd27b

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