Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4b013a5da44bf7…

MALICIOUS

PDF

75.9 KB Created: 2020-12-31 23:22:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 71fa0da271a5cdf728b17a00e7b310cd SHA-1: ef809f3b527f501cb6bcd2b571fdb64008c80f39 SHA-256: 4e4b013a5da44bf7cc67e7ac1444dab893a5f9b9b2370e5edaa444c7c10aec75
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, specifically for containing a large number of external links and a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous links suggests an attempt to redirect users to potentially harmful content or for SEO manipulation. The file's purpose appears to be related to distributing malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://gettraff.ru/123?utm_term=pokemon+liquid+crystal+move+deleter In PDF document text
    • https://sisodiwitamusoz.weebly.com/uploads/1/3/2/6/132681746/dupodez-pudojoso-barel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407085/normal_5fa112007361b.pdfIn PDF document text
    • https://zetaxufonepijak.weebly.com/uploads/1/3/4/3/134353616/gupewesuwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_5f88a3167363b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426424/normal_5fdeb2eab5259.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477658/normal_5fcd0f54727fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494874/normal_5fe3ba42752df.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/tixedujegibex/xomopunufakozezogivijozuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a50c3f6c-d809-41b8-bce2-636fc30050a4/vovabulode.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/all_you_can_eat_seats_pnc_park.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f327f746-9414-4e48-853f-df57cc4be2ba/flixmovies._online_five_feet_apart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7e238c3-7524-4e8a-8307-f210e8d8bafb/ppsspp_gold_apk_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62b57150-1b56-487e-81fe-65c50d9b3143/zolovotixobimada.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_off0000dbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 3740 bytes
SHA-256: dcc664f553f4270f6203861609e13253ef24a3975106b822e2dbf43761f9589f
font_01_sfnt_off0000e8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D1 5436 bytes
SHA-256: 5be8f6c2c2ed5709efd8efb2b1cb343359518dc3d91cd65a091d8e371e0b4e20
font_02_sfnt_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 10932 bytes
SHA-256: 2aef435cad91fdd8414ced42b429ada4da583712901d02ec37058144e5fdb9b8

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