Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c1ebf1155a9c4c0…

MALICIOUS

PDF

88.6 KB Created: 2021-04-05 07:39:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f1efcff8ff9b530797397053668ebfd0 SHA-1: 565c4179151363da358c68a278189709cda46bf1 SHA-256: 2c1ebf1155a9c4c0194ce8e4060342b9968545985b105642c4702c90c8ccfac9
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 0.9981

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://dafemum.ru/123?utm_term=bundelkhand+university+form+2019 PDF link annotation
    • http://raguvigawak.mypressonline.com/tooling_for_metal_forming_process.pdfIn PDF document text
    • http://fagumawegoleleb.mypressonline.com/jurnal_ascomycetes.pdfIn PDF document text
    • http://lupazul.mywebcommunity.org/unity_asset_store_sale_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fonivez.epizy.com/fibazanewadumukusotasak.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/74096673873.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/jasuxotosobo.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/47728098482.pdfIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_e973e5da4f964691bb31309cdbf1eaf3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/charminar_malayalam_film_songs.pdfIn PDF document text
    • http://pafojamivorizim.epizy.com/65295622557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f237c967-e4e3-4b4c-a480-9c4aeb0f1124/liruluxanizel.pdfIn PDF document text
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_e770b9f1f0f04b119813c355bb2d3936.pdf?index=trueIn PDF document text
    • http://sevegefonon.rf.gd/bajaj_allianz_health_insurance_policy_details.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcfb1a78-5e20-40de-bfe7-54bf7e924393/cibola_burn_explained.pdfIn PDF document text
    • http://nodikisiti.rf.gd/bangladesh_government_school_holiday_calendar_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/norton_anthology_of_english_literature_volume_2_10th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/kolabudatora.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/dowesufe.pdfIn PDF document text
    • http://xosumuzav.epizy.com/ludeju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7119e34d-cfab-42eb-9eed-67d6d5ccb718/whirlpool_duet_washer_fault_code_f02.pdfIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_79c7819d49d2413c9f8a14bed9193e98.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/akron_news_reporter_akron_colorado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55d905f4-4947-426c-9c3b-535f81a0fff8/bash_scripting_basics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dba6a208-1c64-472d-8f1b-fd402142ce6b/pippin_sheet_music.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 5788 bytes
SHA-256: c2db8a249d43fff3055fc7e403da003c5dd5580b2552ea8ee1b16eaaa273a8c6
font_01_sfnt_off00010944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10944 11548 bytes
SHA-256: eb9627d7524a78330dc27b26b0a3c07f209000aabf2d249de1ff2ffde1c607d0
font_02_sfnt_off000130b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B5 16164 bytes
SHA-256: 4bd16c8abd39118228c1571b0005d4eb3b3e943e572fd92a2a80cfcb7b749349
font_03_sfnt_off000145ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145CA 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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