Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a240c530edf7132…

MALICIOUS

PDF

79.4 KB Created: 2021-01-17 02:59:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 72542f53fbe54fb444c3381586322e57 SHA-1: 9c0ee4c57b5387fa0c59371af1174e675d9efe99 SHA-256: 7a240c530edf71326fa41853f4029777499e77b18f6bdd1c19e8e10b059e550c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing numerous external URLs likely intended to manipulate search engine rankings or redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the extensive link farm suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://traffking.ru/123?utm_term=pathfinder+achievement+feats PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477638/normal_60035f2abc6dd.pdfIn PDF document text
    • https://buvupoxiku.weebly.com/uploads/1/3/4/3/134329971/pupebexukasir.pdfIn PDF document text
    • https://zadujogor.weebly.com/uploads/1/3/1/4/131406982/2509066.pdfIn PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/rujubawafezepir-juvewipapa-misimova-zavizixi.pdfIn PDF document text
    • https://polaposegit.weebly.com/uploads/1/3/4/5/134591324/vadaka_podigofojowu_megofizokibijuz_jawizarag.pdfIn PDF document text
    • https://site-1176181.mozfiles.com/files/1176181/whatsapp_status_video_tamil_song_2017.pdfIn PDF document text
    • https://fupexojor.weebly.com/uploads/1/3/4/0/134017307/zamutozog.pdfIn PDF document text
    • https://gusizamavuva.weebly.com/uploads/1/3/4/6/134629738/wutola.pdfIn PDF document text
    • https://gazobibulome.weebly.com/uploads/1/3/4/7/134775133/gikudekuwukap.pdfIn PDF document text
    • https://vufupobuzalezu.weebly.com/uploads/1/3/4/8/134853030/zigavafoxuwiro.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/jazofi/bloodlines_book_1_free_download.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_off0000f83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83E 5288 bytes
SHA-256: da73afbbaf70bbe4e42d553ae577e37c42bdb30603998c50cb8c28e10c934c22
font_01_sfnt_off00010a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1E 11528 bytes
SHA-256: 80ff10484f1d61e78a4bf28dfe6c29dbb1213737b2864cfee69bc73e0f729740

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