Malicious PDF — malware analysis report

Static analysis result for SHA-256 897b5ecbdbb91950…

MALICIOUS

PDF

79.2 KB Created: 2021-03-20 20:03:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 606bd36c25f2cdf02539f007a17c5616 SHA-1: b7c0018474417039c836659a9f9ba9eaaecf00ab SHA-256: 897b5ecbdbb9195023c70bf8e2bd9e101e7d6b9d74d212abaa9a14c2d30789cb
186 Risk Score

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 0.9990

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://maypoin.ru/award?keyword=alienated+america+pdf PDF link annotation
    • http://birebap.scienceontheweb.net/pikugumipusegevikogubok.pdfIn PDF document text
    • http://fobativ.mywebcommunity.org/pusokobamiwidezitulev.pdfIn PDF document text
    • http://gakawisogafuga.mygamesonline.org/nubokegidijebo.pdfIn PDF document text
    • https://litiwufedoza.weebly.com/uploads/1/3/0/7/130739575/vanefobifepi.pdfIn PDF document text
    • https://lojavexir.weebly.com/uploads/1/3/5/9/135963097/likilo.pdfIn PDF document text
    • http://xekedofaki.iblogger.org/howls_moving_castle_book_two.pdfIn PDF document text
    • http://rafewasugajeze.22web.org/neo_luddites_anti_technology_extremists_reading_answers.pdfIn PDF document text
    • https://muxolebutelun.weebly.com/uploads/1/3/2/7/132741382/zipomivano.pdfIn PDF document text
    • https://mejapibidar.weebly.com/uploads/1/3/4/3/134315264/melijomumuzig_gejado_karivome.pdfIn PDF document text
    • https://gunisuzafi.weebly.com/uploads/1/3/4/3/134311694/9549040.pdfIn PDF document text
    • http://wapadax.scienceontheweb.net/vukobikurofupake.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_65eb9ea08fa64fc6a354e5e8b0455d93.pdf?index=trueIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_c67d0c176c1d4f1ab3c546424d5c81bf.pdf?index=trueIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_ec929e51a91f4be3808e3b878011054a.pdf?index=trueIn PDF document text
    • http://sabepusejoponi.epizy.com/21275998970.pdfIn PDF document text
    • http://fasikisiteji.epizy.com/lafuvofamufivasor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f32d05c9-39fd-44ea-a064-06331b0938a3/garakosimisafafakeve.pdfIn PDF document text
    • https://04a80c79-134c-446e-801b-0c1635678e59.filesusr.com/ugd/5cebf8_3774aeb87aeb45e0a475d28ab34342cb.pdf?index=trueIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_024c876b6d1e47d7b7a4c69be2bd96f4.pdf?index=trueIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_a6b22e63166845b093a6bf672d4b4f7d.pdf?index=trueIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_f3dcdfebb49a40c2934e7b8b50dd37a0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/efe6b1ad-7f25-41c6-8be8-220d936d8fe6/world_history_textbook_for_high_school.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/galutatezemubunopiwirero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b72d5e49-aa60-4a08-9585-610c5a6f4fd9/xirenawesemawu.pdfIn PDF document text
    • http://sipikoz.epizy.com/791800956.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_off0000f868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF868 5112 bytes
SHA-256: 191ce5e6ee5f9c174996e574b5c685484552c36b2b3901d36526f6716d92439d
font_01_sfnt_off000109b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B9 11040 bytes
SHA-256: f9e4001a1b9957a3981a4333f45e74ba4b5b132f136e3635955fdea35d2ce5ba