Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4de53a5e1c67a7…

MALICIOUS

PDF

156.6 KB Created: 2021-03-15 09:20:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c9e51cbb479ca42137e4317d8ea68820 SHA-1: d5d63a70e9d5c47e333c2d6ecb439ac3a0633fec SHA-256: fe4de53a5e1c67a77b9eb8b3a8e85ed931ce09573cd5f5d40e628df0caa10f36
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('vilenefex.ru') that is likely used for phishing or malware distribution. The document body, though partially corrupted, suggests a lure related to 'official methods of analysis' and 'free download', consistent with a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://vilenefex.ru/award?keyword=official+methods+of+analysis+of+aoac+international+free+download+pdf PDF link annotation
    • https://cdn.sqhk.co/bikegola/ChhihVJ/solitaire_board_game_rules_how_to_play.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390374/normal_5fcbc2f9bed26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481280/normal_603d0b7c5355d.pdfIn PDF document text
    • https://cdn.sqhk.co/mibaforetu/jjghkjd/airliners_forum_trip_reports.pdfIn PDF document text
    • https://meremunodimabak.weebly.com/uploads/1/3/4/5/134516451/bce9f9d.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/jheichj/mafia_city_cheats_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/dutigimomana/jigcesO/condado_pittsburgh_pa.pdfIn PDF document text
    • https://wosaboler.weebly.com/uploads/1/3/4/4/134496590/gisedu.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/phoHjjK/7747445712.pdfIn PDF document text
    • https://liwavijej.weebly.com/uploads/1/3/4/3/134379327/2769006.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_7e6d7f67a09d4934ba6a51e3d95ccf3f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8d321c3-5b59-4c0d-b8e3-66ad1dd3d34b/how_to_write_an_ebook_cookbook.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/varesitevekiwufusivurofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f03211a-4194-4ecf-b77b-337657ed924d/459628912.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/46641662051.pdfIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_0821399a96524e7bad2c73d492413f57.pdf?index=trueIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_631600a4be6f446b87cb6df493aefdb6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rorives/tozebofakadutu.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/birthday_gift_certificate_template_word_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9331479-b894-43d5-8826-57fb1afa4cc3/31741513485.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/511f570a-10f6-46de-8ee6-b728db44dcc8/76064796802.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000237f0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x237F0 23304 bytes
SHA-256: 51420f24c00b75736d10b9b7766b7b14ca994430f792685a504e8d569e64c7a1
font_00_sfnt_off0001f6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F6BE 5616 bytes
SHA-256: e682d2356634262b2063001ca5e6609abf7da98abae08efbfb64c68655332179
font_01_sfnt_off000209c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x209C8 14372 bytes
SHA-256: 4af30319503c68285c38a4dca61e2cce226a9e40a48796f7ef94d68f03734d8d