Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a96416809a8895…

MALICIOUS

PDF

80.9 KB Created: 2021-02-22 01:11:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 279ec5a3ef4d9a19cbf4c683b410371c SHA-1: 222cd3b40220836730a7a1ac9ea9053ced2c4bce SHA-256: 71a96416809a8895d940a708ba3731b160e561209a0e4ff05172a34afceef250
156 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link-farming scheme. It contains numerous external links, with one prominent URL pointing to a potentially malicious script or payload. The document body, though heavily corrupted, suggests a lure related to 'Korean grammar in use advanced book pdf', likely to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/strik?utm_term=korean+grammar+in+use+advanced+book+pdf PDF link annotation
    • https://cdn.sqhk.co/xezafube/hg9KCjd/sujet.pdfIn PDF document text
    • https://cdn.sqhk.co/duditizonut/ifhdUau/palubasukilokera.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/iQgh5je/dekigupebisom.pdfIn PDF document text
    • https://cdn.sqhk.co/tezizejaropu/gfje2hc/amnesia_memories_kent_cg_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/gjciUN8/wood_shop_layout_designs.pdfIn PDF document text
    • https://cdn.sqhk.co/wapuwozelob/jdoPZgf/12953765850.pdfIn PDF document text
    • https://mirinojasuri.weebly.com/uploads/1/3/4/5/134588432/1674072.pdfIn PDF document text
    • https://cdn.sqhk.co/puruwedisuma/8C3ifar/video_gamer_chat_room.pdfIn PDF document text
    • https://cdn.sqhk.co/vujejanar/hcigXLJ/tumalifawaxanixuvijoba.pdfIn PDF document text
    • https://cdn.sqhk.co/diwewiduvaz/fibqTNc/drop_wizard_tower_game.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/laDgdjh/kefolujex.pdfIn PDF document text
    • https://cdn.sqhk.co/vutazazu/Tji36jc/korusodolivenesakinebako.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://banumekopi.epizy.com/jigidifujinikozenowiwit.pdfIn PDF document text
    • http://vomifavub.epizy.com/apartment_architecture_design.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/kuttymovies_2019_malayalam_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/jimufexetirotu.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/runescape_cockatrice_slayer_guide.pdfIn PDF document text
    • http://zigixukotezu.epizy.com/lobarepuzubaf.pdfIn PDF document text
    • http://dakunexafabeve.epizy.com/6718848248.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/31436466789.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/3620346138.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35B 5044 bytes
SHA-256: 0067ae5973dcbbd1a2f9871c2a2ecc604e48b979a5a52ad950d98ad41d600271
font_01_sfnt_off0000f4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C2 5676 bytes
SHA-256: c1a514b6400d63206db3f63f6c286a328344348586b16e50c5e9a548e1574f3c
font_02_sfnt_off000107fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FB 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_03_sfnt_off00011088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11088 10696 bytes
SHA-256: 3ab5d691c849cc15379dc1223c5d0dcafeddc3c70f2f99d345c8b72178983601

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