Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf0bb3f60b1f809…

MALICIOUS

PDF

80.0 KB Created: 2021-03-23 11:30:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c0146a731d2d46cb28c0471a3bcbb2d6 SHA-1: 5936f35de41e169a42834aebdd9a9195e098f5a5 SHA-256: cdf0bb3f60b1f80994c6d865c3a8bdf9ec33b8124a0cac0bc53f87d34ad6bbab
186 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 0.9994

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/award?keyword=english+for+public+relations+book+pdf PDF link annotation
    • http://tikonazab.iblogger.org/65206042510.pdfIn PDF document text
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/9a5ef4ae2.pdfIn PDF document text
    • https://cdn.sqhk.co/xusarukave/S5YMqgf/58863919876.pdfIn PDF document text
    • https://cdn.sqhk.co/xisusituz/bagdKgi/losaraxebutarekibojezome.pdfIn PDF document text
    • https://vajigapevinukaz.weebly.com/uploads/1/3/4/5/134578345/xibixodud.pdfIn PDF document text
    • https://cdn.sqhk.co/xetokive/7HhdjbS/15283305226.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/cEYhiih/dotloop_support_customer_service_number.pdfIn PDF document text
    • http://titonigofitazi.iblogger.org/genijeletola.pdfIn PDF document text
    • https://cdn.sqhk.co/pefevepufi/MhdLsij/67660157189.pdfIn PDF document text
    • http://nufudotaruja.iblogger.org/acres_of_diamonds_by_russell_h._conwell.pdfIn PDF document text
    • https://lipazugarajoko.weebly.com/uploads/1/3/5/3/135318447/bubadavawi.pdfIn PDF document text
    • https://zagarete.weebly.com/uploads/1/3/4/6/134687236/900250.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/fd7ca6ac-e4fb-4695-8209-8a5fcf93d84e/play_the_game_of_life_online_with_friends.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b58c636c-4ee6-42db-9aaf-3a8bb56a504c/41168334656.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4b07921-772e-49ff-bac6-d5d143f96b33/faxomal.pdfIn PDF document text
    • http://pugonekiwijotom.rf.gd/flamenco_guitar_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/533e9dbd-2c4d-4e52-8835-d51fcc6bc866/what_does_ra_feel_like_in_your_hands.pdfIn PDF document text
    • http://sotunisa.epizy.com/29830330767.pdfIn PDF document text
    • http://lezapogitoda.rf.gd/pemixudizolitaribigajegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11f7c53d-ff35-4a12-b394-87a1012a6e32/gepetilunukutapurumowefuv.pdfIn PDF document text
    • http://zonefodewev.rf.gd/91343623197.pdfIn PDF document text
    • http://gewumene.epizy.com/25210818329.pdfIn PDF document text
    • http://rusozetowozo.epizy.com/subclinical_endometritis_in_cows.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_off0000ef8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8E 5580 bytes
SHA-256: 179820de952bcf5f8e79921aa61426e114632627f06a61bb80768de35405dcc8
font_01_sfnt_off00010283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10283 18096 bytes
SHA-256: b521a96b97a202accef28cedcfb73506766ea2210f55a3c15fc7e2efdb9f32bd

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