Malicious PDF — malware analysis report

Static analysis result for SHA-256 b358078f6a6f8b74…

MALICIOUS

PDF

82.1 KB Created: 2021-03-31 09:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 87e806ed36a261a938f1ac59df4518f6 SHA-1: 52f802826807acae759c4b477b144174074ad63b SHA-256: b358078f6a6f8b74d2afbf863b0eb5e6a73dfcdf13ff3292a382a49659c376ea
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9967

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 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.
  • 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://kuzutuzo.ru/strik?utm_term=what+does+e3+mean+on+a+samsung+washing+machine PDF link annotation
    • https://gubagomokugexat.weebly.com/uploads/1/3/3/9/133988684/c7a73c1e5.pdfIn PDF document text
    • https://getenulezawo.weebly.com/uploads/1/3/4/8/134897364/fixezaxew-wamuxi-xuvukufujid.pdfIn PDF document text
    • https://cdn.sqhk.co/bimolixumotu/i8haCic/zonalo.pdfIn PDF document text
    • http://com-signto5.xyz/dc_comics_seriesaj9i5.pdfIn PDF document text
    • https://bunixidulot.weebly.com/uploads/1/3/5/9/135964284/7680576.pdfIn PDF document text
    • http://1fps.ru/kogusidegumasabumagef2sfm.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/E3X2fhi/3582412072.pdfIn PDF document text
    • https://bulugigedi.weebly.com/uploads/1/3/4/7/134714886/todoz_tasukote.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://lerexujirizafet.weebly.com/uploads/1/3/4/3/134344290/famokum.pdfIn PDF document text
    • http://damita.fun/38180975792alykk.pdfIn PDF document text
    • https://cdn.sqhk.co/tarolaser/ihdii9C/my_pillow_sheets.pdfIn PDF document text
    • https://cdn.sqhk.co/zatufora/jeehhaz/black_friday_2020_apple_watch_canada.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/falufusu/gabofedidojelerirutewupeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb516698-e769-4bde-8698-40426b5ad6c7/motuvumejuka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15fd93b1-2267-416e-a6da-7ebc9a6d3fbc/fikudiketasepubefu.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/dd_4e_sorcerer_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/91361098157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/205af698-22b2-465a-92da-47b4571217aa/hp_deskjet_2544_printer.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/92338174088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/125d2207-83ac-4565-97e5-80e62f36d079/45295397656.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/common_core_standards_ela_grade_2_reading_informational_text.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/cheat_engine_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5b105bf-ba41-4b73-9608-6289cdda828d/ryobi_18v_chainsaw_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/roku_streaming_stick_plus_headphone_edition_target.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/pifubagelusim.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_off000102df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DF 5492 bytes
SHA-256: 81ab57fbfea28827c5c04996f67cf94046568242cce5c95f9177f7a40c4bbfdd
font_01_sfnt_off0001158a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158A 10940 bytes
SHA-256: a02c76d4c86a35a17bf797a08b1b14cffa2dc0efc139d54d2c9e24e05be0b05d

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