Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6e779453aeb3bd…

MALICIOUS

PDF

70.5 KB Created: 2021-06-10 20:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 67db216be9fbac1682a67e11b59d8315 SHA-1: a94ea69e4c0723ea199ddf84e7ef9afbd0925ffe SHA-256: ba6e779453aeb3bd5b47556dd12ff94434db915328a62f7ad4a450b098ab63a3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with a significant number hosted on disposable domains. The primary purpose appears to be SEO manipulation or directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://nomylo.ru/pbw?utm_term=bible+trivia+multiple+choice+questions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368772/normal_5fdf006a62a8c.pdfIn PDF document text
    • https://resodapiperuxa.weebly.com/uploads/1/3/1/4/131407292/c84f458b723f48c.pdfIn PDF document text
    • https://wapatawavef.weebly.com/uploads/1/3/4/7/134775304/bamagalobewaxad_kasozirakiz.pdfIn PDF document text
    • https://lerorenoj.weebly.com/uploads/1/3/5/3/135390996/8150020.pdfIn PDF document text
    • https://luxaxila.weebly.com/uploads/1/3/0/8/130814132/motek.pdfIn PDF document text
    • https://nilitidov.weebly.com/uploads/1/3/4/4/134475433/jibitok_gobakigamoxetul_tuwanezu_mavagavidera.pdfIn PDF document text
    • https://kusajigoma.weebly.com/uploads/1/3/6/0/136036420/3778094.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4476947/normal_60b1b4ad24bd6.pdfIn PDF document text
    • https://ronawidafaleso.weebly.com/uploads/1/3/4/5/134504313/5243254.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484818/normal_5fdc49452d1d4.pdfIn PDF document text
    • https://woxujinugav.weebly.com/uploads/1/3/4/3/134305359/3444796.pdfIn PDF document text
    • https://vuzupugum.weebly.com/uploads/1/3/1/4/131453250/6913481.pdfIn PDF document text
    • https://newavutija.weebly.com/uploads/1/3/1/8/131871734/xokivex_numukid_gurasi_vetejekovusipu.pdfIn PDF document text
    • https://rijetebo.weebly.com/uploads/1/3/1/3/131398233/gijefolo-gemorox-gikuvakeda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bekiravetad.pbworks.com/w/file/fetch/144884808/revukutanuvoj.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/4233872345.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b5230d5-9fc7-4928-a1ca-d302102e581d/dafedu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fda32f89-3e25-4a2a-b10b-4fd7cc3ba4cc/best_unity_games_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdb29086-d9be-4b09-893e-c890a4244df8/tasukejifuzugopep.pdfIn PDF document text
    • http://sawebaz.pbworks.com/w/file/fetch/144776763/41121032247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f249c84c-687f-4595-a806-ae6c3cf423ef/official_myers_briggs_test_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/371f3a9e-9492-41f3-b78d-bb2b0a61d11c/diary_of_a_wimpy_kid_old_school_character_description.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_off0000d5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C0 5548 bytes
SHA-256: c3055f0199ff0065d0ac109ebcac7b847d175e570b7646635b3d4a46039a3e5c
font_01_sfnt_off0000e877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE877 10688 bytes
SHA-256: c64851a044ac2315d2fbe1171cc74b395da8b5c9b323e5cf6be7839db62c0c61