Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d526216f0a02a4c…

MALICIOUS

PDF

63.3 KB Created: 2020-12-16 05:55:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1e0f4558d231a9897c119e9b6553864 SHA-1: 1fcbb053a281ee560368ce61635d559b5d53559d SHA-256: 2d526216f0a02a4cd9cea2397910f47c99288e916f829c7c6c3141545dbc5327
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and flagged as potentially malicious redirectors. The document body, though heavily obfuscated, suggests a lure related to 'workbook answers', indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://cctraff.ru/strik?utm_term=unite+1+lecon+1+workbook+answers+blanc
    • https://jadegivi.weebly.com/uploads/1/3/4/8/134851053/rofola.pdf
    • https://zukigepuzena.weebly.com/uploads/1/3/4/5/134593101/3922829.pdf
    • https://gowutejuvotebap.weebly.com/uploads/1/3/4/3/134372770/211390b9a54e.pdf
    • https://kozesetod.weebly.com/uploads/1/3/4/5/134507136/3171281.pdf
    • https://wejusapud.weebly.com/uploads/1/3/4/6/134614256/4e22542ffc3d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static1.squarespace.com/static/5fc165fda8793968640bd5e7/t/5fcbe1e01415195da0929482/1607197153576/96544582221.pdf
    • https://uploads.strikinglycdn.com/files/24f681e0-c43e-418a-b5af-10fb8f137add/zebaduxuzawesub.pdf
    • https://uploads.strikinglycdn.com/files/ca93c9eb-309a-4a7f-9da6-16825e466adf/trig_ratio_practice_worksheet.pdf
    • https://s3.amazonaws.com/palikuvexake/94877726119.pdf
    • https://s3.amazonaws.com/lorugipopuxe/redafafavodubiboj.pdf
    • https://uploads.strikinglycdn.com/files/246c30ab-6558-4a41-a000-01da36c0747d/28252543076.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ada1.bin
36b4be0ccdd58754f4b0125524e1e6e250540f15ed2e6687d479ba30005f4631		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADA1 4920 bytes
font_01_sfnt_off0000be79.bin
e1a240769405a5805382c92fe23fe4ea7a1899e434169b2cd735d366dd972c38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE79 10556 bytes
font_02_sfnt_off0000e089.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE089 4324 bytes

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