Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf1e831fef83b29…

MALICIOUS

PDF

130.1 KB Created: 2021-04-06 23:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e863327e7ae8559c6fca1eac711b49b0 SHA-1: 5654bb2572454699a920b190030860d2b1b85af8 SHA-256: caf1e831fef83b29de647bf6d805f85dd895069a3cdbaa6dfb79c2e6284f9345
186 Risk Score

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 0.9993

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/123?utm_term=water%2527+s+journey+worksheet+answers PDF link annotation
    • http://zunuruxeguxifi.mygamesonline.org/jimemetozovuginibe.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/ZtjhVsK/jinja_template_django.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/cjjggjc/tovupeta.pdfIn PDF document text
    • http://fegivate.medianewsonline.com/best_reader_for_ipad_2.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CvgiczF/ragaduwojak.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/fjsjaqi/zubitadalarov.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopijaku/Bwiaijc/cheat_pokemon_emerald_gba_android_rare_candy.pdfIn PDF document text
    • http://zitirisiz.mywebcommunity.org/44722679484.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/cWa6ieg/iowa_storm_damage_satellite_image.pdfIn PDF document text
    • https://cdn.sqhk.co/tibapopedeka/r6ha0ie/xenalemadugezubi.pdfIn PDF document text
    • http://babusokojanog.sportsontheweb.net/67042202748.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/3978c776-2a38-4bab-bc42-1d54b47415bb/88827450500.pdfIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_f6b336d408b046319b3dd084a3035e94.pdf?index=trueIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_3e82bd2e2c034feaa9757c48276eeff7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/67993e1e-42c1-45c1-a679-c096aaefd5c5/31971556410.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cfe0d75-f925-4575-b4f9-765f6900493b/guwevamugapizawadiz.pdfIn PDF document text
    • http://vapewokadovusa.myartsonline.com/sixukitekakifimavivuzonu.pdfIn PDF document text
    • https://fb3efafe-1b0e-41a1-9434-8bf556110c4a.filesusr.com/ugd/de5e41_cc3e83bf4f14475982ac279a58331792.pdf?index=trueIn PDF document text
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_04f38714b48040cb951f2011af28def5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/118c26f2-6a89-4ebb-b806-bff5a6e398b7/17649648719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7946bfe1-61a0-4fb5-aa4a-8dfb96927fcc/centripetal_force_definition_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d29da30-50d6-42b8-a597-eaa3f6d2bf3d/the_book_of_thoth_first_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4047df4c-6ece-446d-a252-285421ba0b89/beretta_a300_outlander_semi-auto_shotgun_with_black_synthetic_stock_-_12_gauge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/084e8668-e708-4728-a842-8b380d53a63d/59117559497.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac2f0940-eea8-490f-8cf7-c68cf0b926bd/how_do_i_clean_my_lg_inverter_direct_drive_top_load_washer.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_off0001bff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFF1 5120 bytes
SHA-256: 19440705ccc13afb94d88dfd7b5479994e11f9b710d2aee257f66eb035352b56
font_01_sfnt_off0001d17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D17F 12168 bytes
SHA-256: 5c2ad4c160a3d9883a1825789dcc538cb7fdb8f7793fad51f36ee4693c2d88b3