Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ba0609bd2442f1…

MALICIOUS

PDF

76.0 KB Created: 2021-04-06 02:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3d069758e75f52b8494e5b9bc1b30b0f SHA-1: ca0aefc1b17a3cc9e70460c475a9d2dad50ac545 SHA-256: e5ba0609bd2442f195a5b5ddf5f2f596a91630230ff7a44d49d3ddec859f75d9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or trojan distribution attempt. While no scripts were directly extracted, the nature of the link farm suggests an attempt to redirect users to malicious sites, possibly for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/123?utm_term=king+size+fitted+bed+sheet+tesco PDF link annotation
    • https://cdn.sqhk.co/bufutoje/WgiVTjh/esfolio_rose_essence_mask_sheet.pdfIn PDF document text
    • http://jirafka.space/map_horror_for_minecraft2filk.pdfIn PDF document text
    • https://cdn.sqhk.co/dolavalof/jvaqtny/itr_acknowledgement_form_2014-_15.pdfIn PDF document text
    • http://creditreportus.info/how_to_install_the_bully_dog_gt_tunernn56k.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/ggfRgjk/omron_blood_pressure_cuff_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/bP9ijgc/telugu_mp4_mobile_movies_free_download_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/Higphhd/88482707087.pdfIn PDF document text
    • http://top-odejda.com/the_conversion_code_audiobooknbc4a.pdfIn PDF document text
    • http://findfreegirl.com/pudurebosgy4pg.pdfIn PDF document text
    • https://cdn.sqhk.co/movijomo/ibjgicd/6537868900.pdfIn PDF document text
    • https://cdn.sqhk.co/migawudewiw/gcTUsha/gufuxusasitixajafazuzivor.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/31d5f87d-572d-490c-b938-ae22e034dd33/summary_of_alex_rider_scorpia_rising.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2b15b34-37a9-497f-8171-551d35c0ce39/how_to_start_a_freelance_writing_business_with_no_experience.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/ronometijorolikak.pdfIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_947fa7c24f424f059edd50dd9e434c66.pdf?index=trueIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_d73e7b98ab414c729f0753df4cde8a32.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/rigozozopezo.pdfIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_3164d7ed70664352816ed8b9ed672b20.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/silagovob.pdfIn PDF document text
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_cf62e97db7ec41069108f3806b21ecf1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovilowab/60209911090.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_off0000e9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A5 5104 bytes
SHA-256: 50ab0e320d032fa617443eb0b700b228bd57018786dbadc50fe8deb8c68565cc
font_01_sfnt_off0000fb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 11080 bytes
SHA-256: 5c08e9e787be553868c3de4d77be0080414d3f84621a638e252be0c11e1a0282