Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac10b02fa8ea80a3…

MALICIOUS

PDF

115.9 KB Created: 2021-06-13 18:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3fb2e81ec654a5481bdb46684a20b42b SHA-1: 54c53462c12f306b168a1a86ec47c78b68927627 SHA-256: ac10b02fa8ea80a3986e18a134b9ad5ec6425e5baecd25c4465d6493ea51a95e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://crysiq.ru/pbw?utm_term=n5+vocabulary+bangla+pdf PDF link annotation
    • https://zeziruxowajud.weebly.com/uploads/1/3/4/6/134698921/2386268.pdfIn PDF document text
    • https://zigaxedalinuj.weebly.com/uploads/1/3/4/0/134016671/ca263d.pdfIn PDF document text
    • https://wozofawado.weebly.com/uploads/1/3/0/8/130874325/4307537.pdfIn PDF document text
    • https://sagopitura.weebly.com/uploads/1/3/1/1/131164573/xigikewudo_bikur_fetowakewepu.pdfIn PDF document text
    • https://kegovivaxik.weebly.com/uploads/1/3/4/5/134506491/d9a5a77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377381/normal_603427393f4d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378153/normal_5fc5f518dcf24.pdfIn PDF document text
    • https://tafuposavibado.weebly.com/uploads/1/3/4/0/134017079/3746951.pdfIn PDF document text
    • https://vazatevetag.weebly.com/uploads/1/3/0/8/130874289/8e96f709b36a39.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/9cf1d0b9-1509-42e3-86af-dea3dbf98d07/rojagiguki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5a007ad-1d30-4a9f-ab47-e4f520a7dd36/fupekizanidise.pdfIn PDF document text
    • http://detomipipu.pbworks.com/f/susegapupi.pdfIn PDF document text
    • http://boxedaw.pbworks.com/w/file/fetch/145252365/clash_of_clans_hack_easy.pdfIn PDF document text
    • http://goxuluk.pbworks.com/w/file/fetch/145127541/zavorodebeduxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a418fc80-adf0-4e19-866f-4d64fb0fd042/super_mario_bros_2_nes_guide.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/w/file/fetch/144464484/asma_ul_husna_with_urdu_meaning_and_wazifa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42e4f643-f5ad-423b-b4e2-ccc1d3dbff5f/didotodisesinikitelenaj.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E0 6744 bytes
SHA-256: 0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
font_01_sfnt_off00011497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11497 13712 bytes
SHA-256: fe37cd05461094aab15de4bcdfd85eae7a83ffad3c529c1dd54496972f5e5aa1
font_02_sfnt_off00014111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14111 5176 bytes
SHA-256: f8678fd2aa28f13686236d041f1c6c762675c647427da8b42f1b95e21e2addb2
font_03_sfnt_off000152b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B5 21804 bytes
SHA-256: 555bdabc1f7c339e12aa4f054b64e11889cd6b0863a74324f359ba58c896040e
font_04_sfnt_off00018d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D83 10940 bytes
SHA-256: 20e27ef3891b90f98e07ff2d4720a50ad5226b823af810bccd0058a1cb389f44
font_05_sfnt_off0001b2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2EA 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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