Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51490accd211043…

MALICIOUS

PDF

69.2 KB Created: 2021-04-02 01:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e1533766c6f42e58fe3b96cd68e7ba37 SHA-1: 5e33c2a6cf22cd2a6a6afdfccadb5f2a5964c08c SHA-256: e51490accd2110431fd955aab01a1cb6c663aaeb99ddb9ad5fae2ed4647f99a4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic identifying it as a PDF link farm. One of the primary external URLs, 'https://maypoin.ru/award?keyword=annabac+philo+pdf', is flagged as suspicious. While no scripts were directly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to malicious content, potentially for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://maypoin.ru/award?keyword=annabac+philo+pdf PDF link annotation
    • https://rusakubasarozu.weebly.com/uploads/1/3/4/2/134266120/8a4bab50.pdfIn PDF document text
    • https://waxujonugo.weebly.com/uploads/1/3/1/8/131871493/fe729be07ab3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481699/normal_5fc86108939f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366620/normal_605593ffc2254.pdfIn PDF document text
    • http://nubolats.xyz/how_to_fit_overhead_door_closer6gu6i.pdfIn PDF document text
    • https://noberewesuxo.weebly.com/uploads/1/3/1/3/131379636/wikakodobag.pdfIn PDF document text
    • http://help-bluebadgecenter.com/beyblade_burst_rivals_download158h8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405899/normal_60190ae1374e1.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/lemefofutomapox/calendar_2019_november.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/emulator_android_for_macbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/959897d0-1724-489d-8ea7-c487f154c375/enders_shadow_chapter_20_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/rerakexunugi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b2b4267-dcdd-4deb-8f8c-695bf0847d89/what_is_a_system_bus_in_computer_science.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00192dc5-3fca-4c4d-9d78-a1e4ba272637/icici_best_mutual_fund_for_sip_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/18978957585.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/viraxiwekoviwonodute.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/gagujopujefuzefozuzekek.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/channels_of_oral_communication.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70d86d01-b94f-475c-a5e6-29c60e3be94e/32237288702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/217317e6-f7fd-4fc2-a526-062e68eaa6c5/tisopufamamilafinabara.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_off0000c4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EB 4688 bytes
SHA-256: beb261883eca514d51a5ef92de13594863ca07d009a7f223299f62482763a5ac
font_01_sfnt_off0000d4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B7 11024 bytes
SHA-256: ac03e5dd60d9a426dcedc5ddb8357b74fb26a48379fe86cddda64e80ead7b85c
font_02_sfnt_off0000f851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF851 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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