Malicious PDF — malware analysis report

Static analysis result for SHA-256 057cb59331b6fee5…

MALICIOUS

PDF

80.3 KB Created: 2021-02-25 10:25:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0704965772816fd75f505a7904fa135e SHA-1: 99539c77f4efce2f5e5caadac3b6ec80ecf2f0d1 SHA-256: 057cb59331b6fee5bf04173b1a4ed6627c4f2874f5fa2071dc3be0920e25fc3c
244 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm or SEO manipulation. ClamAV also detected it as Pdf.Phishing.Trojan. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malicious redirection attempt, likely designed to lure users to harmful sites. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

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
  • 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 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.
  • 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=seat+of+the+soul+chapter+10+summary In PDF document text
    • https://cdn.sqhk.co/zamupefa/hNjdhei/45270053124.pdfIn PDF document text
    • https://zadobezaja.weebly.com/uploads/1/3/0/7/130775221/suvamobasepuped_resijuge_tiwola.pdfIn PDF document text
    • http://rameautbxy.space/72166147262u77z7.pdfIn PDF document text
    • http://dayzcommunity.info/lg_plasma_gold_air_conditioner_remote_control_manualspryk.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/11463431583.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/jhiaEhe/wedafopejevuxe.pdfIn PDF document text
    • https://wutotopuwa.weebly.com/uploads/1/3/4/4/134464713/vazaxotapefebanusim.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/namubisavot.pdfIn PDF document text
    • http://topdouche.xyz/86879725665gse9u.pdfIn PDF document text
    • http://gooddevice-online.com/boneless_chicken_breast_nutrition_informationqu2w2.pdfIn PDF document text
    • http://lnstagramverifiedbadge-form.com/what_is_the_structural_difference_of_dna_and_rna_brainly71x22.pdfIn PDF document text
    • https://cdn.sqhk.co/mudogaxi/jk0Ndia/strawberry_and_cream_sponge_cake_recipe.pdfIn PDF document text
    • https://cdn.sqhk.co/xexerekija/gckPPif/utah_high_school_basketball_all_star_game.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwuzasemifo/gjAOIhh/tshwane_free_wifi_app_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rosajeku.myartsonline.com/rapibovowoxu.pdfIn PDF document text
    • http://pujumek.myartsonline.com/69378247808.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_off0000f160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF160 2940 bytes
SHA-256: 5abd1102bbb49cd9fee3e8c7db4f4b96944035d8cd52b1c4794f50b825db5b40
font_01_sfnt_off0000fbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEC 5656 bytes
SHA-256: 9c94c8c403e633cdb0423f0976069c2b4acbce3c8e01bdcc90bb6b15d0120ca7
font_02_sfnt_off00010f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F13 10636 bytes
SHA-256: 98c642d1a122d4a7ad7ce7ba86266aa25dd2681899753c9cd348d3aa5d0d9c18

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