Malicious PDF — malware analysis report

Static analysis result for SHA-256 a544b7d3a77bfa41…

MALICIOUS

PDF

79.4 KB Created: 2021-03-20 04:49:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9601db796313d1607f7b28cb21b80ad2 SHA-1: 097032cf0c2e4a04dd5383c40c04f7916227bfea SHA-256: a544b7d3a77bfa412fa4ad42727e0789d055e33470e8bfb37b5fcb091b93376b
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 0.9990

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 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://crophysi.ru/strik?utm_term=are+ketogenic+diets+bad+for+you PDF link annotation
    • http://jujojewufi.iblogger.org/gudotedinibikuw.pdfIn PDF document text
    • http://tramlaweq.online/73905384033kdds6.pdfIn PDF document text
    • http://yachts-4-sale.com/ultimate_shark_simulator_apk_1._29pu7x.pdfIn PDF document text
    • http://zootime.store/3741148979002ub6.pdfIn PDF document text
    • http://idealicaitalia-official.site/ziminelilos7pnf.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/10c1ee85-40e5-4b24-a96d-9ef762faca36/88325040295.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/dakumumidijebapuvugumux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a96fde21-34e5-4767-b33e-9421d87bd760/let_it_rain_in_spanish.pdfIn PDF document text
    • http://mobotifiriw.epizy.com/boy_scout_handbook_requirements.pdfIn PDF document text
    • https://ee67c5b3-b4d3-4257-b425-af55881d3a68.filesusr.com/ugd/c60da7_facebd20df954abab4d4230c14282efd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/xozolofamadolagafumemi.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/addictive_drums_2_full_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/complex_number_examples_with_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/79894290933.pdfIn PDF document text
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_6bab49cd882049109b874d5603d6279b.pdf?index=trueIn PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_0ea2eede95704374a83a1b26396a06e9.pdf?index=trueIn PDF document text
    • http://remupuxuwuved.rf.gd/85476779691.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69c2315d-d827-49ff-8294-8e1db3166729/what_is_the_fundamental_trigonometric_identity.pdfIn PDF document text
    • https://s3.amazonaws.com/falejogajir/dafolifitav.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/14867980236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1edcbd4c-e84f-4235-abab-98f57fed9b88/is_forex_trading_worth_it_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3701f76-3db1-44ac-847b-6c481cbdd0f1/vewuwipejorijasum.pdfIn PDF document text
    • http://xaviwawav.epizy.com/zivikubedutukasuvofibi.pdfIn PDF document text
    • https://7f2467c6-0d80-4e38-8df7-27624e0b9669.filesusr.com/ugd/e19533_c3ffe8231173429e825be3b64f54c3e8.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_off0000ed53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 2900 bytes
SHA-256: 10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a
font_01_sfnt_off0000f796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 5452 bytes
SHA-256: cd1555774244f1f4b86a9d36a0b3e9f2584593eb21fc462c74a5419a150ad28a
font_02_sfnt_off00010a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A41 10772 bytes
SHA-256: ee5abb835f89c1905f87abf628d5e7c9e4cbb83dbce9ff9601d93f6c25ee7501

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