Malicious PDF — malware analysis report

Static analysis result for SHA-256 b00e72f05ec7dd46…

MALICIOUS

PDF

76.1 KB Created: 2021-02-11 18:36:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3d92af6f51bff04b2d392ec3310b72b5 SHA-1: 0f777e345a2725f8aa6f4d0523df47f0bcccecb2 SHA-256: b00e72f05ec7dd46973294faaefd734d2a53b7df0bfe93ab404f62cecaf09e7a
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to `https://yafferge.ru/wix?keyword=whack+the+burglars+unblocked+66`. The PDF also functions as a link farm, with heuristics indicating it contains mass external PDF links, likely to manipulate search engine results or host phishing content. No scripts were extracted, but the presence of embedded URLs and the nature of the heuristics suggest it is designed to redirect users to malicious sites.

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/wix?keyword=whack+the+burglars+unblocked+66 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4367680/normal_5ff3ba4466e56.pdfIn PDF document text
    • https://gafapelisepofas.weebly.com/uploads/1/3/4/7/134762307/vixuf_velonavibav_mibuwajinadeba.pdfIn PDF document text
    • https://cdn.sqhk.co/savaketiju/khhZegg/31157834.pdfIn PDF document text
    • https://cdn.sqhk.co/sifolilo/ghbibha/tirofelarexit.pdfIn PDF document text
    • https://cdn.sqhk.co/fobonelaga/fjgegh1/starlink_internet_cost.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383807/normal_5ffda6f72e41f.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutazomaga/ijFKTDp/cnc_machinist_shop_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/moxelutedoje/d4tnjde/40865536543.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379236/normal_5ff225318626c.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://fokibuzevurir.rf.gd/biological_science_textbook.pdfIn PDF document text
    • http://xelilurezo.epizy.com/taxivonalaguremipetese.pdfIn PDF document text
    • http://lamoren.rf.gd/fabigajiloruzobota.pdfIn PDF document text
    • http://senotujupube.epizy.com/bronya_wutah_video.pdfIn PDF document text
    • http://zodutak.rf.gd/wawopixerulonipigorexix.pdfIn PDF document text
    • http://fuvituze.epizy.com/99_names_of_allah_list_bangla.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_off0000ddbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBD 5404 bytes
SHA-256: 4f9b01d18006b857fad9ba24389ef8aaab789e8424d7e8e51c4bc8aaeffc2677
font_01_sfnt_off0000f016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 10872 bytes
SHA-256: 14b246cfa51a0a121ea6c4516f1bfa949b911d2b0ea83e4b2848b5fcb6ddfb44
font_02_sfnt_off00011533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11533 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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