Malicious PDF — malware analysis report

Static analysis result for SHA-256 545b8dc1ba6e602e…

MALICIOUS

PDF

79.3 KB Created: 2021-03-14 08:58:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bfc32e21195bbcc91b1afbf8cb96d528 SHA-1: c781361bb85a119d8840011bd81af21143e2f139 SHA-256: 545b8dc1ba6e602e842c0df185adf0304873cce4bb3f63e386fa137208f21e35
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://soxebez.ru/wix?keyword=nba+jam+apk+download+for+android+free PDF link annotation
    • http://sunny-web.ru/81528840023zq9nd.pdfIn PDF document text
    • https://xorapuwo.weebly.com/uploads/1/3/0/8/130873927/0cce49.pdfIn PDF document text
    • https://resafuki.weebly.com/uploads/1/3/1/3/131398359/4133755.pdfIn PDF document text
    • https://xajakubadom.weebly.com/uploads/1/3/0/8/130874473/8069551.pdfIn PDF document text
    • https://kajipeluvo.weebly.com/uploads/1/3/4/3/134318391/lopatudilarut.pdfIn PDF document text
    • https://sabalijazot.weebly.com/uploads/1/3/2/6/132695986/e9b636d6.pdfIn PDF document text
    • https://nuzunovi.weebly.com/uploads/1/3/5/3/135314570/8239760.pdfIn PDF document text
    • https://nagugopusoz.weebly.com/uploads/1/3/4/6/134645600/rutejugov-nalulakedajede.pdfIn PDF document text
    • https://gewujezugiwo.weebly.com/uploads/1/3/4/7/134754524/wukax.pdfIn PDF document text
    • http://bezprovodov.guru/giwodaresumetaxabagasedezfsix7.pdfIn PDF document text
    • https://tujupanex.weebly.com/uploads/1/3/5/3/135333196/14f661b.pdfIn PDF document text
    • http://tekaxaxiwirika.iblogger.org/30404686591.pdfIn PDF document text
    • http://xofajenakimexo.iblogger.org/adobe_character_animator_cc_2018.pdfIn PDF document text
    • https://zivodigogugev.weebly.com/uploads/1/3/4/6/134664532/c1d5b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_42a63415a17748dbaae96d08f39365a3.pdf?index=trueIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_df23dcd9c3d04af8b88ebd49ce556801.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_8f2e22ab883741349a47c104ae040331.pdf?index=trueIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_5cec91f8b97548db9c1586a33a9c114d.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE967 5348 bytes
SHA-256: 925c6dbf0336fb961571bb053059d59144a54cbda81a701e317c90b14bd7b722
font_01_sfnt_off0000fb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9E 13160 bytes
SHA-256: e2e4ecc45f6afda72a677e017babe7be2005538c23cace1014d130f1fb635b3c
font_02_sfnt_off000125b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B8 2836 bytes
SHA-256: 49736c7f3cce009c5013dcb32c5ef6d35f991ef48a8fdc363f760cc517610df8

Open this report in the interactive analyzer, or submit your own file for analysis.