Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa4493fb11b820a…

MALICIOUS

PDF

80.3 KB Created: 2021-03-28 17:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 9fbcc27222db13ceda0d5e884686189c SHA-1: 9ea643d56e4a477e484da0c86e4dbd7f6270e2e0 SHA-256: 7aa4493fb11b820a0e9e5c292d96f2801c54fc4766225924baed18d7c83eb9e0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique commonly used in link farms to generate traffic or distribute malicious content. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate this behavior. ClamAV detection and ML classification further support its malicious nature, identifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/award?keyword=anemia+ferropriva+fisiopatologia+pdf PDF link annotation
    • https://cdn.sqhk.co/pijajawopoji/heghsik/zakobojonevikusoje.pdfIn PDF document text
    • http://shopsmmv.site/dell_latitude_e7450_plugged_in_not_chargingu3djm.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/java_8_stream_filter_map_examplekm124.pdfIn PDF document text
    • http://bonmarket.site/gofedimigupemosijoflawip.pdfIn PDF document text
    • https://cdn.sqhk.co/zufuxirap/g01jehe/paponuvilafagovanaxifebok.pdfIn PDF document text
    • https://cdn.sqhk.co/ludukuni/chiCgj8/30109312985.pdfIn PDF document text
    • http://1xbets-reg.site/bokokulijifabofokulojoxhrgr.pdfIn PDF document text
    • http://rekopeza.22web.org/how_to_start_a_samsung_vrt_steam_washer_wont.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_d5e810eecc7240dcac50c1cb49f64ed3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/853e0529-fed2-49bc-b4b4-5d592f1b894e/14246920623.pdfIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_49f59ddb93c942b3881aac29af16c855.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1729310a-92c7-4b18-ae3f-e19786c6e66a/muslim_baby_boy_names_in_urdu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4120b6b-bf36-461a-9713-7cb4325d6a7a/gardners_art_through_the_ages_16th_edition_volume_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40213ee6-42fb-42a7-a1e1-f0076ef3f9c0/81006486901.pdfIn PDF document text
    • http://suwisekuxowiw.epizy.com/69019686901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1efa22cf-7603-4954-83fe-eb43d2251588/printable_english_crossword_puzzles_with_answers_for_adults.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fd40ef7-a7a4-4c68-81a4-d2f1b19de326/lubricating_oil_for_electric_chainsaw.pdfIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_92007a3d86064b2c994c860bd8135b03.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/21c028f3-10fc-4cb8-af5e-e2f2c42f7eba/how_can_i_start_my_car_without_a_key_fob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cae36d3c-f9ba-4324-911f-56516da1b7c4/navien_npe-240a_service_manual.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_off0000f848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF848 5412 bytes
SHA-256: 5e3752cc50defd083cc8be6536f1bf63a0bfeb9b6fd858266e91371a3f614959
font_01_sfnt_off00010a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9E 13484 bytes
SHA-256: 5835679cf5a80dd6b9cae723da32511a0837b54f687bd73040a538828c211c46