Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd687c6f4351a4e…

MALICIOUS

PDF

75.7 KB Created: 2021-03-09 17:55:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 71f6adc29a310f69a38cdae67b7e2d5d SHA-1: 4b8cdd43462f14d408646b8471bb4591ddeaf5eb SHA-256: fdd687c6f4351a4e0472db18c8bf028ca72315826f90b89697a106edcc6e34b9
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 0.9996

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://leonvi.ru/123?utm_term=brawl+stars+hack+apk+21.+77 PDF link annotation
    • https://kifirazet.weebly.com/uploads/1/3/4/7/134715796/sixosutesaruviw-wujar-buliba.pdfIn PDF document text
    • http://berabufepibaj.iblogger.org/bajugavunuxifirafosij.pdfIn PDF document text
    • http://vijuziruzunubiz.iblogger.org/3074517521.pdfIn PDF document text
    • https://jewizebalize.weebly.com/uploads/1/3/4/6/134618682/widopivukezowol_gufon.pdfIn PDF document text
    • https://ninuwekij.weebly.com/uploads/1/3/4/6/134625354/zanelatojofi-xikapulo.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/kezemiradigu/alaipayuthey_tamil_song_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/punoza.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/57182260397.pdfIn PDF document text
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_77814879621b4dba95e5c2b0714d3472.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/what_is_a_tree_trunk_protector.pdfIn PDF document text
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_f2ea52dd5ad5473f8765ec29206b8c9c.pdf?index=trueIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_e6f516415d7147a7900dce0e560a0ccd.pdf?index=trueIn PDF document text
    • http://muxolisakij.epizy.com/74265629319.pdfIn PDF document text
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_84b598f1237047339827e9b6e05d4ee9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dc4491e-dfff-4e72-b731-d0013747bb8e/why_is_newspeak_important_in_1984.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/gupobat.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/in_search_of_our_mothers_gardens_womanist_prose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad9dce61-2ad8-4057-8095-612312b8019b/how_to_install_rancho_steering_stabilizer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f8baa5d-834b-4ef5-982e-270d834ba9b3/what_are_the_important_symbols_in_lord_of_the_flies.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/77748904457.pdfIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_6edaf2a595c843ca8c428849485c7c34.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_off0000dfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE9 5520 bytes
SHA-256: 68f1b328acd83dd1fbc64fa9b03248ba6eb428cd100a6d90670eefbbd4cee117
font_01_sfnt_off0000f2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 2328 bytes
SHA-256: f31c637376c9808ad8935aeb8da5d5e991fbff0630c28cc3129d242addd1c9f4
font_02_sfnt_off0000fd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2E 10524 bytes
SHA-256: 89fd4d215ed7a65c7b693f88785251f90729afc698963dc6d702f3236cd4016b

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