Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38801ff71262f34…

MALICIOUS

PDF

85.6 KB Created: 2021-01-30 09:41:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 73c5225a30e298d6a234d1a4c225fb1c SHA-1: dee35d5b5754a24912699a353c261ca00927605a SHA-256: f38801ff71262f34c09650a0ffc726025b042b49d856116f9334543869dd40e8
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, appears to be a lure related to 'digital imaging processing for medical application'. No scripts were extracted, but the overall structure and heuristic firings point towards a malicious document designed to lead users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=digital+imaging+processing+for+medical+application PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476930/normal_60012ac963dc5.pdfIn PDF document text
    • https://jumojebanofoz.weebly.com/uploads/1/3/5/3/135302369/8931095.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475203/normal_600276532ac33.pdfIn PDF document text
    • http://cybety.xyz/47326782784v9125.pdfIn PDF document text
    • https://ziposubiv.weebly.com/uploads/1/3/0/9/130969570/bobatajuminirasu.pdfIn PDF document text
    • http://wuzotevoxed.22web.org/savolosulaj.pdfIn PDF document text
    • https://fefojaza.weebly.com/uploads/1/3/4/4/134480993/gonepoziromeb_buwitifumuke_ranekim.pdfIn PDF document text
    • http://topmassage.net/talking_droid_apk7lybb.pdfIn PDF document text
    • http://itfamily.info/1617098431757fkf.pdfIn PDF document text
    • http://homebig.space/moto_z_play_front_camera_not_workingr8fj3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421218/normal_601115c07556d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kofipazefoleris.epizy.com/gezegatevekizavom.pdfIn PDF document text
    • http://wikatamuk.rf.gd/zuvogojabejiwiwov.pdfIn PDF document text
    • http://vezoxonu.epizy.com/12th_compartment_exam_date_sheet_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/13613644188.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/bricks_and_balls_hack_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/bunejonaxodovijud.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/autumn_leaves_live_wallpaper_hd_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/13155350772.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_off000110b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B5 5476 bytes
SHA-256: 272a7606314c36584ebb9bc1181daccb69d3d4a491f47416526fc9b19a21c0ea
font_01_sfnt_off00012344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12344 10868 bytes
SHA-256: e1a0734c1067c35a42b2d172db95694fe1fa4159ddf1d99eb595e271b1fbc437

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