Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d77a227171d507f…

MALICIOUS

PDF

71.9 KB Created: 2020-11-17 13:40:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 49e4d9ad949e2f5ad474cd90e2a74ea0 SHA-1: 987745bf0ec3f51182e7017dad6698bc0207e49b SHA-256: 5d77a227171d507f89ef83a90282c266b380374870ce3d6c964de304445caebf
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafftec.ru/strik?utm_term=teach+me+anatomy+app+free PDF link annotation
    • https://gunewobeje.weebly.com/uploads/1/3/4/1/134109175/misozunor.pdfIn PDF document text
    • https://nivufojafofe.weebly.com/uploads/1/3/4/2/134265756/e67cba8.pdfIn PDF document text
    • https://zafimalomaw.weebly.com/uploads/1/3/4/4/134458932/4be1b6dd0e84890.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/gajama.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380082/normal_5f9e0d27a1f55.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/0cbb0043-023d-4c64-b851-09ac643ae2dc/hoover_steamvac_plus_1000_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/33529495096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45447945-c267-4416-a59b-69673c8b1a0e/zivenizaxaduji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d34c950f-da29-4d7d-8749-a7c914531481/ramosuto.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/purple_dragon_fruit_health_benefits.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/dazasebawabuzosokekumuna.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/skyrim_jarl_elisif_mods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5708722-acec-46b0-979a-6461fa480dca/hp_dv7_driver_download.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/dukeju.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_off0000d17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17F 4836 bytes
SHA-256: 7cb84eb799c6503d375548cf5b788372eada82a530ad73634bdc5ad808a86b18
font_01_sfnt_off0000e1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C1 10316 bytes
SHA-256: 4811f100d130953008692ccc12b253af1922a65a36681568e072ac2b882961da
font_02_sfnt_off00010506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10506 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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