Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13974e98136dfc8…

MALICIOUS

PDF

73.5 KB Created: 2021-01-30 09:19:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e563d6e77590459b0d8563196eae500a SHA-1: e307b4309a4efb2366048bce990c376834fc43ad SHA-256: a13974e98136dfc89eb68b0f46c24e81c509fca76060ce19f08e70e1c0ce227d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing campaign. The presence of external URIs and the overall structure indicate an attempt to redirect the user to malicious content.

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 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://jacksth.ru/wb?keyword=basketball%20shot%20live%20wallpaper%20hd PDF link annotation
    • http://saudiautoinsurance.com/analog_and_digital_electronics_notes_vtu3nsjn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413454/normal_601147577cd2d.pdfIn PDF document text
    • http://titoto.xyz/36637534063edbq2.pdfIn PDF document text
    • https://pulapiselipatux.weebly.com/uploads/1/3/1/3/131378970/2f4ef290.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486758/normal_5ffeb4abb93b9.pdfIn PDF document text
    • http://powerhdniy.space/samsung_payment_plan_canada49q5c.pdfIn PDF document text
    • http://trend-sales.fun/952116560485d44b.pdfIn PDF document text
    • http://romeoplanet.club/34354221936i2qrn.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/zombie_killer_costume_ideasjzuvb.pdfIn PDF document text
    • http://bigtittybella.com/street_racing_hd_mod_apk_hack_downloadiy2nc.pdfIn PDF document text
    • http://epipog.com/21840702794w08wp.pdfIn PDF document text
    • https://filududo.weebly.com/uploads/1/3/5/3/135390237/73a547386b.pdfIn PDF document text
    • https://nuzojumikosa.weebly.com/uploads/1/3/0/8/130814298/c012398aeb50.pdfIn PDF document text
    • http://rrrrkkkkk.space/251883289d6rjh.pdfIn PDF document text
    • http://lemiritafuwab.22web.org/play_store_apps_showing_pending.pdfIn PDF document text
    • http://mavitrade.com/troy_bilt_3100_psi_pressure_washer_troubleshootingflz3p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sogefotatuledis.epizy.com/reruxi.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_off0000e2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D4 5452 bytes
SHA-256: 0b665c894a555e0ae444724853e3cfda06c29e005cbe012938af9aae4b04d452
font_01_sfnt_off0000f565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF565 10412 bytes
SHA-256: 2c39349ae443baad9cc76f64cea972b5cdedbcf3d22789a24e0f29952932941f

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