Malicious PDF — malware analysis report

Static analysis result for SHA-256 98dd36d40189ba47…

MALICIOUS

PDF

83.5 KB Created: 2021-02-18 19:44:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 2a4df888d7218ac6ada95be62ca6fb54 SHA-1: fec78c4818f00efe08525813a96b5729c69579a9 SHA-256: 98dd36d40189ba477c4886c722abbc92f1f6798f0b574968fe1f96d4ea1ca429
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a mass of external links, suggesting a link farm or redirection scheme designed to lead users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs strongly suggest an attempt to exploit users through malicious links, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://leonvi.ru/strik?utm_term=types+of+conclusions+for+expository+essays PDF link annotation
    • https://cdn.sqhk.co/zumufapofow/jdDjhij/pomapovajitosavevak.pdfIn PDF document text
    • https://gareketekefebon.weebly.com/uploads/1/3/4/6/134695024/gavifonalidenazi.pdfIn PDF document text
    • https://fumamefix.weebly.com/uploads/1/3/0/8/130873833/6582117.pdfIn PDF document text
    • https://cdn.sqhk.co/momajuxu/gjf0qjb/zain_online_recharge_ksa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383579/normal_5fd2e9ec6cde1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486033/normal_5ffd598279a20.pdfIn PDF document text
    • https://sirowatogiwu.weebly.com/uploads/1/3/2/8/132814809/tugugezuseduzubiwim.pdfIn PDF document text
    • https://jajijonag.weebly.com/uploads/1/3/4/7/134762104/jokarugov.pdfIn PDF document text
    • https://cdn.sqhk.co/medugagoviji/iYigtnH/pl_top_scorer_20_21.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/hjaXgg4/green_dot_mobile_banking.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390999/normal_5fe51f1757d75.pdfIn PDF document text
    • https://vafunaparixidi.weebly.com/uploads/1/3/4/6/134627598/laxotanixori.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489980/normal_600431974ea88.pdfIn PDF document text
    • https://cdn.sqhk.co/buganisazobu/fjf5Shd/sipirotuzavutisux.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/guvovigo/wallpaper_aov_hd_untuk_android.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/lalajamiwetiwubetate.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/xiwavofazaselakadiwira.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/17108708565.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/briggs_stratton_pressure_washer_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/vezikuwakug.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_off00010a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A56 5128 bytes
SHA-256: 23b2232aca72d992e794b6648090ac6706aca8d24d022e6e80f65da27df4d69d
font_01_sfnt_off00011be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE9 10816 bytes
SHA-256: 5ee836e0d8dad8194290f5d0cdade30a10568cae0ad2e61a4244f6f7a74deff4

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