Malicious PDF — malware analysis report

Static analysis result for SHA-256 d934812617702ad1…

MALICIOUS

PDF

78.9 KB Created: 2021-03-18 12:57:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: efc55c3064f697f044c08e48645d5e22 SHA-1: 0d9d9d22a233fc1836a57e05148ee83cb94be78a SHA-256: d934812617702ad19bbb1a7c2877cd5c81d152ca5f1e55cf5a1c52e084386262
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are dynamically generated and point to other PDFs, indicating a link farm or SEO poisoning attempt. One prominent URL, 'https://resalured.ru/aws?utm_term=dark+souls+2+rebel+greatshield+location', is directly embedded and likely serves as a lure. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/aws?utm_term=dark+souls+2+rebel+greatshield+location PDF link annotation
    • http://technodom11.com/my_hp_deskjet_3054_is_printing_blank_pagesbkxp4.pdfIn PDF document text
    • http://avto-document.site/858241605986230w.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://s3.amazonaws.com/gaxuremewuger/jojulagovelinonazixaw.pdfIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_51c6429bf8de4d969972192a33ae7b53.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuses/aatagallu_movie_naa_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/beats_updater_won_t_on_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/current_account_form_of_sbi.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/nifupexebug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1823a353-3fcf-46d5-b3f6-89b8d6fcb3a1/55366705985.pdfIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_8d34b5ecb47242749988134ed41397d8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/verirejon/tigabat.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/bhaagamathie_tamil_movie_free_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebc45752-99aa-4de9-a29d-ff1ba2bd1f88/how_to_replace_bruno_stairlift_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34b75ffb-e6bd-4744-b114-ec8506c2a9fa/stihl_ms_310_chainsaw_price_new.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/85523953108.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/2019_calendar_with_holidays_template.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_off0000ea31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA31 5420 bytes
SHA-256: 325f1f8260837fb11a9c54d29b888fdb235fbbac1fac5e2c7a771c9215400d10
font_01_sfnt_off0000fc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 10256 bytes
SHA-256: 6ad8c40ea0c3abfed996cd9a26b6d4b1fdb59a7d2a589a85d37134eeb1b77649
font_02_sfnt_off00011fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB6 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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