Malicious PDF — malware analysis report

Static analysis result for SHA-256 88819a1994b1dd1e…

MALICIOUS

PDF

95.9 KB Created: 2021-06-01 12:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 227c1410643afe8012ebeb01b407988a SHA-1: 81835b70befd466ed8d4288d7bb0bf932a352082 SHA-256: 88819a1994b1dd1ebd321e286cbfda445c257da7f1f5ab3594f1b4b1536f7950
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9983

Heuristics 5

  • 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 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://infrive.ru/pbw?utm_term=super+smash+bros+ultimate+apk+%252B+obb+full+download+android+mobile PDF link annotation
    • 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/14e0a59a-18ef-4e05-9591-398fc6359317/95266960495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80132203-6b60-4ac9-8a08-7aeb0b0e6228/2000_honda_accord_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9937e8db-86f1-4250-8c94-b61d4931f4c1/59511529598.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f71728f0-64e0-4a8a-87db-a8333163a980/lecoultre_atmos_clock_serial_number_location.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/f/change_32_bit_to_64_bit_windows_8.pdfIn PDF document text
    • http://wuvebag.pbworks.com/w/file/fetch/144428376/99867638851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81628a5e-f565-43e2-a2bb-31bb1cca8743/medoxexowidawapijaxirag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfddccc7-441d-453e-912e-1b23297b37f1/how_to_write_a_social_media_analysis_report.pdfIn PDF document text
    • http://tazijebep.pbworks.com/w/file/fetch/144420324/52528226759.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/f/cdigos_para_tener_diamantes_gratis_en_free_fire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdc84d99-49fd-4e45-a08a-efe0c5d44c50/we_are_number_one_in_different_languages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dada527d-5e3e-47ea-bc96-4437dc9f6d22/what_does_the_term_go_ask_alice_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2694203f-4244-4052-beca-0801af797986/arduino_language_reference.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a646674-95a5-40a9-9898-b4eef1bc92b0/92484095583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ed32d32-3849-419a-8433-3b2d0d623519/litololalaxepodepigi.pdfIn PDF document text
    • http://ganosidil.pbworks.com/f/shadow_fight_2_mod_apk_titan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68f8755f-1820-4ba4-8eed-22dee48f1498/colonial_representation_in_robinson_crusoe_heart_of_darkness_and_a_passage_to_india.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144417756/how_to_know_what_size_your_gucci_belt_is.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6292609-992a-4c4b-b725-7d06279d253f/will_galaxy_s8_get_android_10.pdfIn PDF document text
    • http://bupataved.pbworks.com/w/file/fetch/144419772/les_alphas_livre_du_maitre.pdfIn PDF document text
    • http://betosaxugawi.pbworks.com/f/jivezolofanejetuwabufuwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71497f0e-4105-4ef6-be8c-394f87345e40/zuvexotu.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001060d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060D 2980 bytes
SHA-256: 54286c762eb567aef610ba2dcd5ff1e2962bd3426718724b7f741070b4c46d4b
font_01_sfnt_off000110ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AC 5560 bytes
SHA-256: f14b370299757308f0275bad0965ebf7f51068ef2c81f937c1716e30e262b266
font_02_sfnt_off00012371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12371 12660 bytes
SHA-256: 0f6e36c31587362fd96b61b7d35feecf9353e7eedfd0e0a9da6e3a15c89ff03d
font_03_sfnt_off00014cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCA 16188 bytes
SHA-256: 7e65d7c141f6633033d336b69ed00ea2f7c82277208e6259d347f0fe361f4493
font_04_sfnt_off00016208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16208 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34