Malicious PDF — malware analysis report

Static analysis result for SHA-256 28825df6a77c22b0…

MALICIOUS

PDF

75.5 KB Created: 2021-04-08 04:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e068d09a8b96d12ac8f1bc08f3958a09 SHA-1: 57b96e09555ebf00e9724be54af6c6319e6cb373 SHA-256: 28825df6a77c22b02142c358446c128be44088efbe095f9836b17770c879544f
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 0.9996

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://jumiwimov.ru/strik?utm_term=why+is+my+water+heater+always+running PDF link annotation
    • http://testersairf.xyz/rovatupapabumuzebewima4q3gp.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/geiht5m/bingo_cage_set_target.pdfIn PDF document text
    • https://cdn.sqhk.co/tibapopedeka/ggh84XS/43003184309.pdfIn PDF document text
    • https://cdn.sqhk.co/kurafuso/jljejit/11331399721.pdfIn PDF document text
    • https://cdn.sqhk.co/pumafuki/gijhd9g/pinball_arcade_pinbot.pdfIn PDF document text
    • http://lnstagram-helping.live/how_to_reset_flip_video_camerais9mt.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/heShdih/24618613638.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/X1jhjv8/57541262259.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/YRwjejF/internet_radio_trance_music.pdfIn PDF document text
    • http://tizezs.xyz/class_1_maths_worksheet_downloadw4qjg.pdfIn PDF document text
    • https://cdn.sqhk.co/bofotabi/f8jhggW/train_your_brain_day.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/ivjcjj6/free_love_songs_ringtones_for_iphone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff8eac81-0dee-4da4-b7c1-1dee070544a7.filesusr.com/ugd/2637cf_f5f6dfedc5af4d99a74f4ce6be67a060.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/049810cb-e354-45c7-a152-add654738cfd/rekuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a0af39d-ec94-4e75-934a-6f92d7c63774/wilejasedotebeboti.pdfIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/where_the_wild_things_like_book_quotes_inside_all_of_us.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/926cf4fc-e5be-443b-ae66-915692802c08/dozolopome.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/photoshop_tutorials_photo_effects_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/dead_or_alive_6_save_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b90a80d8-6b33-40be-839d-ad8bfda698e8/statistics_freedman_4th_edition.pdfIn PDF document text
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_6d6bc15ec77140fe99fb5a614ea70779.pdf?index=trueIn PDF document text
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_4bcce5ef316c40c683623a6553b2c49b.pdf?index=trueIn 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_off0000e932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 5304 bytes
SHA-256: 46c1beec36ecc7a07fcb95cf5574e65a9b0da7493a9726c48dfd28998a63232f
font_01_sfnt_off0000fb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2E 11344 bytes
SHA-256: 609255df675c1a0843ec3c328d8bf2ac30dff498c84d35cb24186ce9ecb1529b