Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac99e356f20acfd9…

MALICIOUS

PDF

81.0 KB Created: 2021-03-18 00:27:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 758cbe656c76e96d5ca9a0828370d65c SHA-1: 94abf130238afb498cb5797020636bf8a4bcbba0 SHA-256: ac99e356f20acfd9225704ec1b29c95c2055492fe5c311c837633c8a28c43414
96 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 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 0.9997

Heuristics 4

  • 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://baarspo.ru/wix?keyword=commercial+farming+definition+in+a+sentence PDF link annotation
    • http://yarrebitteh.online/supararixenuwjvcrk.pdfIn PDF document text
    • http://yandex-delivery.cc/jakazedizeborem9bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470977/normal_602b4188e1221.pdfIn PDF document text
    • http://wajufogisabo.iblogger.org/12470486360.pdfIn PDF document text
    • http://betmoy57.com/oxford_picture_dictionary_workbook_free07ali.pdfIn PDF document text
    • http://rinobavosudarew.iblogger.org/razovakom.pdfIn PDF document text
    • http://temagezo.iblogger.org/19939755672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420747/normal_604b9e0ab339d.pdfIn PDF document text
    • http://rodina38.ru/42422820897xo0yg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387226/normal_602e00795b172.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/panalipolifod/543265601.pdfIn PDF document text
    • http://memefememojimuz.epizy.com/35057437835.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/eleanor_rigby_piano_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/japanese_food_guide_app.pdfIn PDF document text
    • http://nejovafejasujob.rf.gd/gujukibanudesekizewobog.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/aashiqui_songs_2.pdfIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_9ed68cbf68a14ca89141311512a3ceb6.pdf?index=trueIn PDF document text
    • http://gexilel.rf.gd/ssc_stenographer_previous_paper_2020.pdfIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_6c9af148d9fd407fbdf5e02cbc3d5753.pdf?index=trueIn PDF document text
    • https://9f1be152-2ea1-4306-981d-bfff62ad382d.filesusr.com/ugd/08fb22_6394129a2a6e499f9466d33bd79d5f72.pdf?index=trueIn PDF document text
    • http://kurujabarufuxe.rf.gd/apollo_justice_3ds.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE00 5248 bytes
SHA-256: c215f5b293d719efd3b11771f98e5e379a2748db44b13ccc65172b44f7d4a2b3
font_01_sfnt_off00010fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBC 10816 bytes
SHA-256: f8684b58a65357e6decd79f4b5326a63b40cd33645bff1d3874b08b4072a0742

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