Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af9a7ad7b6b87b2…

MALICIOUS

PDF

100.6 KB Created: 2021-05-23 14:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1314f88233d23455ea7e3975fe508ae3 SHA-1: 73a7324d8d480480151aaabe40004a2429190752 SHA-256: 4af9a7ad7b6b87b27958f49865f5f4626baf40aa9a66530168f36e2a01252c52
156 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 5

  • 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.
  • 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://seumenha.ru/strik?utm_term=the+impossible+quiz+book+chapter+3+hacked+unblocked PDF link annotation
    • https://novatoful.weebly.com/uploads/1/3/0/9/130969934/6298047.pdfIn PDF document text
    • https://xufudigu.weebly.com/uploads/1/3/4/5/134515134/bifamufumogo.pdfIn PDF document text
    • https://rudofodirofebas.weebly.com/uploads/1/3/0/7/130739781/9724103.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/9d8c20da-b064-4b6c-bb6c-d16e5d8b1303/what_are_some_good_drills_for_basketball.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/codeword_barbelon_danger_in_the_vatican.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10dc890d-52ef-4bb0-a694-61cb63d78427/liber_latin_root_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fda3f22-bd27-4275-b3be-0c312129f9ea/silence_is_the_language_of_god_all_else_is_poor.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/33587754951.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/medeledokobabegorimove.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/chernobyl_2019_full.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/591e3881-6da9-4cd1-85a4-bb489ec93051/club_car_onward_body_kit_for_precedent.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/41090054891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b4e5960-ba39-4b45-9fe1-e36e4ab16653/zekixoxujod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b283f55-bde9-4e04-8b7e-20dc1af7df50/60700032356.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/2004_mercury_grand_marquis_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/nintendo_3ds_pokemon_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c1b190b-521f-4835-9fdc-760a48326462/kitchenaid_food_mixer_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cab42574-320e-40e9-ba6b-5946fa82078b/what_are_some_brand_names_for_ibuprofen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ee2aa1e-0d1f-4ba1-a35c-3a70b5dd2235/naked.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/64485449142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ea2e525-9b81-4d69-9ca0-aa0bb83bd942/74436402194.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/how_to_reset_netgear_router_wnr2000v3.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_off00013cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDD 5688 bytes
SHA-256: fc7421c42e0a85c26be1705fa05a430100ac9316ef647cafd84489f4e75b06aa
font_01_sfnt_off00015003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15003 11124 bytes
SHA-256: a21a49037a5968e3d36704aa47106820dc831045ac9f16a42530d6a8d85b5eb4
font_02_sfnt_off000175dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175DD 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176