Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55e1bbb6a83b4be…

MALICIOUS

PDF

82.4 KB Created: 2021-04-03 01:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2136548312a95e9fe17fabc22e32fa1f SHA-1: 41f64e2329bbbbb2106cbb25a74ae11c74385c89 SHA-256: f55e1bbb6a83b4bea921334237c4d9e0305f97903b1cb5f7835ed00e51c6f5dd
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicative of a link farm or SEO spamming operation. ClamAV and ML classifiers identified the PDF as malicious, specifically flagging it as a phishing trojan. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wix?keyword=grandmother+willow+song PDF link annotation
    • http://kind-insta.site/gopro_hero4_black_specswg6h8.pdfIn PDF document text
    • http://1-bog.ru/soveve2bjz5.pdfIn PDF document text
    • https://nabisomo.weebly.com/uploads/1/3/5/9/135993280/0e85264331.pdfIn PDF document text
    • http://demumamudu.22web.org/nizudabaxufanemonivodejof.pdfIn PDF document text
    • http://xikofav.iblogger.org/pefubamolilorusag.pdfIn PDF document text
    • http://cg-designer.xyz/xuduzelaxojemavabunodeegkh8.pdfIn PDF document text
    • https://foretenam.weebly.com/uploads/1/3/4/7/134700633/6485531.pdfIn PDF document text
    • https://defasoxajex.weebly.com/uploads/1/3/1/4/131405962/b3251.pdfIn PDF document text
    • http://idealica-tufficiale.website/jill_yousef_murder_colorado_springswipns.pdfIn PDF document text
    • http://onlyforyou.space/toyota_camry_2018_le_specswj3xy.pdfIn PDF document text
    • http://imedo.ru/can_you_feel_your_milk_glands96awl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b84445ba-e7a1-4fd8-8111-c1ffcaf1473d/maxonidixugeseduvebilokup.pdfIn PDF document text
    • http://bitivapudubidi.epizy.com/83887849439.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d47ddbf7-e3de-46b9-87c1-228e8aad6176/what_is_unbearable_lightness_of_being.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27f89483-fee3-4b5f-b4c6-4a6f43d0aaf6/the_14_books_removed_from_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b2bc3d6-d4aa-4838-b9c1-d8352d3792c7/keteb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e649aae-03ff-4f5b-a334-70e535068dbf/what_were_the_three_reconstruction_plans_after_civil_war.pdfIn PDF document text
    • http://wovutemikinodow.rf.gd/birds_of_paradise_font_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b01ff0c8-4594-4a20-897d-5c1d33491ab5/vowujinetogodesupomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0400fd03-c967-4bc3-9790-95efb07d2a30/gevaxad.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_off0001021a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021A 5360 bytes
SHA-256: bdcdcc1ad90a8bbc8d6044c670a23c30970e15d242c6d433fb855e6e68e709ba
font_01_sfnt_off0001143e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143E 11628 bytes
SHA-256: df6dc249aab296f025abc09f11ce601776e8d2ff3f20dc4804565abdaf7fd034