Malicious PDF — malware analysis report

Static analysis result for SHA-256 beb510b21660e901…

MALICIOUS

PDF

83.2 KB Created: 2021-03-16 20:26:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 43fb69fab94312e120c91c9c9933ddbc SHA-1: ed47550603b2d5fddeac2e8cbb5993a6331a61dc SHA-256: beb510b21660e901ce4d8d77476b1718de472e788b07b55cdeba41f507b9cb62
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 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=forsaken+flyff+bp+guide PDF link annotation
    • https://cdn.sqhk.co/tipesewete/iaXhfgi/jesadesigojesorovofitij.pdfIn PDF document text
    • https://cdn.sqhk.co/tofigidukug/CYlHjit/case_39_movie_tamil_dubbed.pdfIn PDF document text
    • https://cdn.sqhk.co/wupifufexix/gcvjjsc/zaxedamuwu.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/Ghjk1gd/spider_stickman_rope_hero_gangster_crime_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/egjKr3i/free_weather_apps_for_android_mobile.pdfIn PDF document text
    • http://vufexojotakoj.iblogger.org/dream_interpretation_in_islam_book.pdfIn PDF document text
    • https://cdn.sqhk.co/kilobubag/khexsgg/85381313480.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/ibhc7ji/new_super_mario_bros_adventures.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvurero/iuibhab/food_wars_manga_ending_erina_and_soma.pdfIn PDF document text
    • http://tuvugisuxizew.iblogger.org/tcs_quantitative_aptitude_questions.pdfIn PDF document text
    • http://popukudaweg.22web.org/gta_v_online_hanger_guide.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
    • https://uploads.strikinglycdn.com/files/b8d097c8-6a99-4385-b7e3-2b9c5edf80f5/dnd_5e_critical_hit_attack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bb18418-6306-4fb3-b5f6-4de61b6e9583/ryobi_bt3000_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b472b41a-cf10-45e6-9e8d-b3e43aaff15f/45718616953.pdfIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_39b07993e50c4fb0bc5cfef9ff790e4e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5cf02fe-de84-44de-b2a0-ed026483f3b2/bijesinofabusolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6313c7a1-c169-4f00-9cc0-0f0b5678b165/nafapamefebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de90c17c-0f24-4f3b-9e96-4d2d4e1f5ce5/how_many_red_words_are_in_the_bible.pdfIn PDF document text
    • http://ragomoxos.rf.gd/the_courage_to_be_disliked_review.pdfIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_fa69693e1e3047d0946b3e9a6cc69f08.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd93779e-c6b9-4f87-9710-7b6673367dae/sigubixudopanekej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/960b08f8-9138-47a7-a26e-de04fa7c1f54/dapple_sausage_dog_puppies_for_sale.pdfIn PDF document text
    • http://kexobub.rf.gd/with_winning_in_mind_book.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF767 5272 bytes
SHA-256: d235036be4fe79b0301b45f14dd95a1910c723c04185427b123608bcb6a65753
font_01_sfnt_off00010964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10964 11244 bytes
SHA-256: f448643da084ff42d8de589722a0cf04a92e738ef92cbeb1a706f509a96b5dd5
font_02_sfnt_off00012fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB9 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f