Malicious PDF — malware analysis report

Static analysis result for SHA-256 7121a9d02640d36e…

MALICIOUS

PDF

77.9 KB Created: 2021-03-30 20:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c1308e738eb16c945fd122957ef1eede SHA-1: e48e1bcf18fcaef7928ee7fc72f6af4cb5975c64 SHA-256: 7121a9d02640d36e41adc85b42571daadc93e6b4ddeaa7649794107e24249f16
186 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 pointing to disposable hosting, suggesting a link farm or SEO spamming operation. The presence of ClamAV detection and ML flagging indicates malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=app+service+plan+arm+template PDF link annotation
    • http://sifisomatexow.sportsontheweb.net/91333886734.pdfIn PDF document text
    • http://vorakumezaxof.mygamesonline.org/new_cpt_codes_for_2020_neurology.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/jarawaxanivu/wijukazix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5491921-54b5-4960-a949-7cd751f4e9df/enron_the_smartest_guys_in_the_room_discussion_questions_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/hashar_movie_full_hd.pdfIn PDF document text
    • http://dirazonun.myartsonline.com/59754842278.pdfIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_cf50176cacd1452f9db66e7efbd65b6b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lunojol/arrival_of_the_birds_sheet_music_orchestra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec12f564-6b71-4815-a2e1-5de306fd533f/majejozivaberuwuze.pdfIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_fba189990a8841fbb962d46a5542558e.pdf?index=trueIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_5afcf111f1fb4036bd5dc7254d92be48.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e357190a-699c-434c-ab75-ed52e29b9acf/myers_briggs_test_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4360a504-ca20-40e9-8356-d857c5ff7f1c/currency_trading_for_dummies_latest_edition.pdfIn PDF document text
    • https://a95edb9d-21e5-46e4-bb1b-b1fdf66a5dae.filesusr.com/ugd/09e34a_4dd4b22f417d4c708403dae60d4adc5b.pdf?index=trueIn PDF document text
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_58b51b43a8a64106b6ccedac6c04cad6.pdf?index=trueIn PDF document text
    • https://cb70cc59-2297-49c3-b7e2-2ac7e26e28d4.filesusr.com/ugd/4479ed_8afdbcd32556431c968caccc87eb3fdf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7cb7f97-b3a0-4bb4-b982-0589dccdb633/86298279310.pdfIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_0adac1c035164ac2bcd02a8b56741ec9.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B2 4804 bytes
SHA-256: a2195e427beb87de45e9c7cc599979669b3ee15404612b6e803ebb69e2153001
font_01_sfnt_off0000f4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 11156 bytes
SHA-256: 3c87ad5669450cf0fc222dc1fe2c4652fb4e6a02426812850e4e7dfb3bdcd028
font_02_sfnt_off00011afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFA 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333