Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4ab6e8fe9adb1a…

MALICIOUS

PDF

74.6 KB Created: 2021-02-23 17:33:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 633103eb9b43901cd0a6db6c1a5f9235 SHA-1: dc22be24f9c8b4bb764ff9a41e5ccd233029c73f SHA-256: 4c4ab6e8fe9adb1a682c5e040e0ee3028a7a762f66f1a1d9448d4c2fc04ed22c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to interview preparation, which is a common tactic for phishing or malware distribution.

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
  • 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.
  • 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=how+to+prepare+for+an+interview+for+a+senior+management+position PDF link annotation
    • https://tezifotunojoke.weebly.com/uploads/1/3/0/7/130776805/zisitabefobodizotole.pdfIn PDF document text
    • https://cdn.sqhk.co/luwosera/eiigjgi/bitmoji_login_on_computer.pdfIn PDF document text
    • https://cdn.sqhk.co/menodotitit/czozOji/lalefekodowowinira.pdfIn PDF document text
    • https://cdn.sqhk.co/forexidof/hjXNWu6/48793392470.pdfIn PDF document text
    • https://pofifeluvoka.weebly.com/uploads/1/3/0/7/130739131/vakaxokuzunexa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384640/normal_6013b22805e61.pdfIn PDF document text
    • https://rejomopoxe.weebly.com/uploads/1/3/1/3/131383333/7265499.pdfIn PDF document text
    • https://tanuroxej.weebly.com/uploads/1/3/4/1/134131309/827945.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495400/normal_600c38c22382c.pdfIn PDF document text
    • https://samituvejasuw.weebly.com/uploads/1/3/1/4/131406365/buxorezaz.pdfIn PDF document text
    • https://cdn.sqhk.co/xejadukoxeta/iaBjfhj/doordash_login_error_driver.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465025/normal_5fd66a5e370fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495976/normal_5fe389a45388d.pdfIn PDF document text
    • https://savozajit.weebly.com/uploads/1/3/5/3/135320594/9281167.pdfIn PDF document text
    • https://cdn.sqhk.co/kanedufopuma/iUibieE/the_walking_dead_road_to_survival_cheat_engine.pdfIn PDF document text
    • https://fabofosozani.weebly.com/uploads/1/3/4/8/134870462/depox-zanikidifufe-gevurixagu.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/ieiejeV/alarm_clock_amazon_uk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456135/normal_5fce604ee16ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 5300 bytes
SHA-256: d39de67bdd78fd6fe9f88ebedcab6f1d614e9f4e90148a18c61537d996273f40
font_01_sfnt_off0000f827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF827 10616 bytes
SHA-256: 91af40ec1cae5b8298c94255aa5e6dfc152efaa403420952dca380b7c41055e7

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