Malicious PDF — malware analysis report

Static analysis result for SHA-256 ede8a7dccae5a664…

MALICIOUS

PDF

118.3 KB Created: 2021-04-05 11:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9f3bb1027f3b6388d7b6ef768f0204d0 SHA-1: bd8bd69f52948eea08e75c45585c229be57dce6a SHA-256: ede8a7dccae5a664fcba267e821970878ff5bb11184fedcd355db3dd6ce298a9
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 domains and hosting services, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/award?keyword=effective+technical+communication+anne+eisenberg+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472768/normal_60555226c51eb.pdfIn PDF document text
    • http://tryadasert.online/naruto_blazing_apk_mod_2._6._1x86dl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373241/normal_5fea3c1d120a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391921/normal_602c9f8a7871a.pdfIn PDF document text
    • http://stylecurtains.com/3953018448zm12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496389/normal_606477a5629ce.pdfIn PDF document text
    • http://itverys.space/samsung_front_loader_washer_error_code_4esutlf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443608/normal_603d2e4c72b33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417312/normal_6001e42edb503.pdfIn PDF document text
    • http://polikarmonolit.ru/inorganic_chemistry_best_book_for_mscl9gxm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380379/normal_60434c8cc7ae4.pdfIn PDF document text
    • http://sbrf.link/gift_of_finest_wheat_bicentennial32jyt.pdfIn PDF document text
    • http://italylife.pro/mary_shelley_frankenstein_free_movie_onlinekjgkb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477386/normal_60587688c9125.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/10d84296-cd7a-4aef-b005-a84fa04a81f1/98588144774.pdfIn PDF document text
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_edc569b04d594dde9254ea6aab77f684.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/808ca8fb-67b3-4f3f-b087-b6ed518d8b11/xozomuwujizox.pdfIn PDF document text
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_598d17614a8146bf985d0e2c6c5c1959.pdf?index=trueIn PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_3ffc488cd3cb4c76ad77549e59af5992.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f790036-4ac1-44b5-b637-19afd9536994/insinkerator_evolution_excel_1_2_hp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39e9a15d-f35d-4309-871f-49107767922e/92536329062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/888ed99c-5167-4be8-b3c0-2e00cf445f37/31981468378.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_off000183ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183ED 5608 bytes
SHA-256: 157a026c2f17f7821622c483d48295c219cb1c526f9bedfd184cdc6501a05509
font_01_sfnt_off000196c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196C9 11056 bytes
SHA-256: 58a2813c8ec720fee92e4d30af1c24e0562ff66d4fae740a20fc56cba566ab31
font_02_sfnt_off0001bc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC95 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c