Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38361cd54cda729…

MALICIOUS

PDF

80.0 KB Created: 2021-03-30 15:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a799f8e08af81cbda45703a1c3434289 SHA-1: 57bf62c7f8ed2e4e92eb498da5186f762c1b1475 SHA-256: c38361cd54cda7295bb38cfac49f7df8f7c845d379b9301c0c1ba8e4bc84b9b1
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 0.9991

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://nipisod.ru/award?keyword=oxidative+stress+antioxidants+and+stress+tolerance+pdf PDF link annotation
    • https://zipuwuxa.weebly.com/uploads/1/3/4/3/134376087/ferudejig-zufira-mivaxexu-fuwabirupuvat.pdfIn PDF document text
    • http://venatavokawudo.iblogger.org/15323445211.pdfIn PDF document text
    • http://mikrotikwizard.com/directions_to_our_lady_of_the_lake_hospital_baton_rouge_louisianapktdf.pdfIn PDF document text
    • https://betirowi.weebly.com/uploads/1/3/4/6/134661799/putaxe_lokafukasomevon.pdfIn PDF document text
    • https://jirakeleda.weebly.com/uploads/1/3/5/9/135992973/5886094.pdfIn PDF document text
    • https://sajabewegapin.weebly.com/uploads/1/3/4/5/134592402/2aee95e06835255.pdfIn PDF document text
    • http://strgb2.ru/apache_jmeter_2._11_freewui5r.pdfIn PDF document text
    • https://semetipakes.weebly.com/uploads/1/3/0/7/130775831/bulikowot.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/mupukesunobaga/92253436521.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/lg_g2_price_in_bangladesh.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/domotuxewamubefobofabodo.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/rich_dad_poor_dad_free_read_online.pdfIn PDF document text
    • http://kapivuvarebe.rf.gd/3dmark_time_spy_benchmark.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d58f7c4f-2d31-47d7-9efc-36475a6ebe5c/stephen_king_it_full_movie_2017_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81b9b64a-743f-4835-a513-03f61db7a31c/71883835822.pdfIn PDF document text
    • http://letituxis.epizy.com/zeromopogiwan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd1a410c-8cfc-4b1b-af81-adb2f4a389c4/dichotomous_key_worksheet_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/12656704003.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/truyn_kiu_trn_b.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc7e5f87-f13b-4818-aee8-f9ea26d4ea5c/37546948856.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/aarambam_songs_ringtones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ce60199-31ae-4566-9d6b-62fb25ac970b/bafizizugevaxivawaxosamen.pdfIn PDF document text
    • http://zirafefovijab.epizy.com/scerts_manual_espaol.pdfIn PDF document text
    • http://rusesav.rf.gd/pomoruti.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_off0000f866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF866 5304 bytes
SHA-256: 1c55679f157555bd64850c74a81a64ac18706072c69c1c6a5ab1a637fd83a5ca
font_01_sfnt_off00010a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8A 12560 bytes
SHA-256: 55adae2c303d2d6e4b08c814c0662c9b4dd5b553903b3dadc1d0ad55aa2cb924

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