Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e057cc7b96605e8…

MALICIOUS

PDF

87.0 KB Created: 2021-05-16 17:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f51a6fcb0c19344617f596b81ad47a70 SHA-1: 2ac20f1fabd13a7cf9810104aca38d3989465ea8 SHA-256: 3e057cc7b96605e8f2e1deb4dc9ec4b2c8f687e9bda20d237320c176a121b9b6
66 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 0.9998

Heuristics 4

  • 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://jottigo.ru/strik?utm_term=international+finance+lecture+notes+pdf PDF link annotation
    • https://ponekuxu.weebly.com/uploads/1/3/4/7/134747949/4592154.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459054/normal_60373ce072342.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417214/normal_6004d6195460d.pdfIn PDF document text
    • https://muwewixobajigu.weebly.com/uploads/1/3/4/3/134312624/1246d2cc2136b32.pdfIn PDF document text
    • https://gamidamivagug.weebly.com/uploads/1/3/5/3/135324690/6959336.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://loletusu.rf.gd/zurezodotidawakexow.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/how_to_disassemble_maytag_bravos_xl_dryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d57f5bad-2d18-412a-aa2b-cc54acd81d1b/day_trading_bitcoin_on_robinhood_reddit.pdfIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_d39db5e0e9fd44548b70d88b1b90fcbd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/883c5a5d-0655-4a98-8e63-2c969d99a61a/dell_precision_m4800_ram_upgrade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de1d5ac0-09eb-4d4c-9522-0d3c0e5e57ce/geotechnical_engineering_definition_of_terms.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/citadel_miniatures_painting_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db6c77b4-771a-4cf8-a3cf-703fed38c979/is_pathfinder_enough_for_nda.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/dragonfable_ascendant_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/88216180150.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/acls_study_guide_5th_edition.pdfIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_31d15e50049343968b8473e13b123d81.pdf?index=trueIn PDF document text
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_1a88acd7984343beb2a0a38da8fce448.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d55c0e3-7865-4a93-9539-52fee054df38/mokelelemitejozudigixuk.pdfIn PDF document text
    • http://jabowedufup.epizy.com/relay_with_force_guided_contacts.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_off00011748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11748 5088 bytes
SHA-256: 6526668212789eaf05fe046d2a9a11a344925f8961b0363b8d8f00b6a0cb4d7a
font_01_sfnt_off000128a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A2 11208 bytes
SHA-256: 19f51db697ddc768b249eb03f86d8f75570f3d6d35f1f488b1288e60b276e6f7

Open this report in the interactive analyzer, or submit your own file for analysis.