Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa22fe8971d96745…

MALICIOUS

PDF

73.2 KB Created: 2021-03-27 17:16:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b803ea1c5f52238685c1e8410dcb4ba6 SHA-1: d1965aa9c2b88e066bed2624179c99907eb1d9d7 SHA-256: aa22fe8971d967456c11cff814e92d9192179a2b530aef20983c7879525cf18b
186 Risk Score

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 hosting, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://fokemale.ru/123?utm_term=contractions+worksheet+for+5th+grade PDF link annotation
    • http://springital.fun/algebra_1_word_problems_worksheet9nkwp.pdfIn PDF document text
    • https://cdn.sqhk.co/rosubeno/8hajghe/visual_code_format_c.pdfIn PDF document text
    • http://porn77.design/96459909923jstpp.pdfIn PDF document text
    • https://cdn.sqhk.co/xezafube/jahgvhg/retro8_nes_emulator_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/febutatesu/CJ4AgfX/52475709948.pdfIn PDF document text
    • http://topagut.iblogger.org/how_to_clean_a_necchi_sewing_machine.pdfIn PDF document text
    • http://xenotobewaf.22web.org/sda_hymn_book_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/zYjJjjy/cloudy_with_achance_of_meatballs_cast_list.pdfIn PDF document text
    • http://rodamajepudoz.22web.org/39532365506.pdfIn PDF document text
    • http://businesshelpservice.com/13403143448kydsz.pdfIn PDF document text
    • https://dovezoluwebib.weebly.com/uploads/1/3/4/0/134017866/5700228.pdfIn PDF document text
    • https://vowipolijej.weebly.com/uploads/1/3/4/7/134713390/9211197.pdfIn PDF document text
    • https://riwivuzis.weebly.com/uploads/1/3/4/2/134265818/9a2900a8.pdfIn PDF document text
    • https://gotukedefiwukub.weebly.com/uploads/1/3/5/3/135309477/62f51d96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://saduxax.epizy.com/chakram_telugu_songs.pdfIn PDF document text
    • https://9e084d23-5bbf-42ad-98e9-fa9200f8584e.filesusr.com/ugd/4f663b_83243f37b5be4dce910e1176dcbf5aeb.pdf?index=trueIn PDF document text
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_b27c10b9f3e24c3cb46553567c11d5f5.pdf?index=trueIn PDF document text
    • http://vibexezesi.epizy.com/62716238728.pdfIn PDF document text
    • https://667b589a-70dd-4c78-a03f-47f6e9f07b1f.filesusr.com/ugd/db80c5_59d5fddd53dc47e18dbaf7da9e96a0d1.pdf?index=trueIn PDF document text
    • http://widagutevutedik.epizy.com/satedasafog.pdfIn PDF document text
    • http://folujas.epizy.com/70790383197.pdfIn PDF document text
    • http://fozabenisos.epizy.com/64885344558.pdfIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_5f327cdd84524c84a8909fe482c7177d.pdf?index=trueIn 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_off0000e11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11F 5436 bytes
SHA-256: adeecc7b9639503f4fd688f0ab5a32e3f547870ace8b67ff83b6ab3db612ea22
font_01_sfnt_off0000f3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 10448 bytes
SHA-256: a042bdbd80b3c8fa4e0a8ee83f1440e5d21b6bd192bda9eb7db93449fe39abdf