Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f2c0b46e09cbc2f…

MALICIOUS

PDF

76.0 KB Created: 2021-03-30 01:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7895337013e8e493b9f0f47018dca652 SHA-1: 93abdd7042255c5a69e142b950963a4d80d08dd0 SHA-256: 0f2c0b46e09cbc2fba0a229249da884f60698fe5418e9e6ae94fb05728b8542c
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm designed to distribute malicious content. The primary URL, 'https://yafferge.ru/strik?utm_term=why+won%2527t+the+wifi+work+on+my+samsung+phone', suggests a phishing lure related to technical support for mobile devices. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a dropper or phishing page.

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=why+won%2527t+the+wifi+work+on+my+samsung+phone In PDF document text
    • https://jiwazumirinupe.weebly.com/uploads/1/3/4/3/134352382/6970330.pdfIn PDF document text
    • https://varigezizado.weebly.com/uploads/1/3/4/4/134480105/6028471.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479691/normal_605f8ac4b0dbe.pdfIn PDF document text
    • https://tobadagagu.weebly.com/uploads/1/3/4/7/134750152/6577725.pdfIn PDF document text
    • http://fovikoxesaweziz.medianewsonline.com/why_is_my_lawnmower_backfiring.pdfIn PDF document text
    • https://nanejebowobo.weebly.com/uploads/1/3/1/1/131163631/lofuwulexumaj.pdfIn PDF document text
    • http://zutumufedige.getenjoyment.net/76552413005.pdfIn PDF document text
    • https://jeregixir.weebly.com/uploads/1/3/1/3/131381720/031daff24bcf5d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374848/normal_6017870bd4862.pdfIn PDF document text
    • https://jebezijako.weebly.com/uploads/1/3/5/9/135964749/4115595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389376/normal_605212e812e47.pdfIn PDF document text
    • http://pazolozul.mypressonline.com/70701591909.pdfIn PDF document text
    • https://disaximineta.weebly.com/uploads/1/3/4/8/134883765/wuxaxi_gapexovoxameki_tarobij.pdfIn PDF document text
    • https://valutakawewa.weebly.com/uploads/1/3/1/3/131378791/vimisibexozi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xezaretidatoro.onlinewebshop.net/gazetifuxowogi.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/80499165584.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/31326629683.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_off0000e989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 5588 bytes
SHA-256: b1767b3383aa33f7939a0164e0f9b0018c7dfe8a7a58eecec94725efb329bc13
font_01_sfnt_off0000fc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9B 11232 bytes
SHA-256: c5279380bfc59aad5ce890c999eca585881c1d0c4de671a1e88e3962e578d6ba

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