Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c478aec46e409b9…

MALICIOUS

PDF

73.6 KB Created: 2021-03-17 11:40:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f8b75a1c19ac51bba09fe06be5900961 SHA-1: 1b022db049beafce2ef9dd29c07aff1f52985b5c SHA-256: 1c478aec46e409b9532b9a7f484f2d70878b272c860f6a3fa21c6ff8e5209c16
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://golowaki.ru/wix?keyword=letter+from+a+friend+skyrim+reddit PDF link annotation
    • https://tibilizam.weebly.com/uploads/1/3/0/7/130775373/wokenutij.pdfIn PDF document text
    • https://wetifojijebene.weebly.com/uploads/1/3/4/4/134474841/d0e124e.pdfIn PDF document text
    • https://wogalipa.weebly.com/uploads/1/3/4/3/134316604/dazumafig-wifudadanom-tiraposedeme-wipadakujas.pdfIn PDF document text
    • https://luvofebujapima.weebly.com/uploads/1/3/0/9/130969865/8123339.pdfIn PDF document text
    • https://kunajulitamajel.weebly.com/uploads/1/3/4/5/134530001/zupabisiz_gibagux_sigasa_zoseral.pdfIn PDF document text
    • https://bajozofexowabir.weebly.com/uploads/1/3/1/3/131398176/wotaralofojiwit.pdfIn PDF document text
    • https://nakagikirowi.weebly.com/uploads/1/3/2/6/132695306/lojilebabowumidera.pdfIn PDF document text
    • http://sefajoga.iblogger.org/14119953843.pdfIn PDF document text
    • https://gubijebe.weebly.com/uploads/1/3/1/4/131483267/85d3d689a204bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_2d6574ed631948578a0ce03a1914fb38.pdf?index=trueIn PDF document text
    • http://zutotakome.epizy.com/bezinolalab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a25bc7f3-e664-4299-ba69-c1d3bdd67372/jebipabozebilewov.pdfIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_40b726a4a64a418aaa9b7d1b077ac5ab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9042198f-a921-446e-b35a-3bfaaa7fa958/what_is_customer_perception_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7ae9acf-3383-4d14-bf2d-b5f8d9ede58b/static_and_dynamic_characters_in_the_adventures_of_huckleberry_finn.pdfIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_9aa322248ca243fb8d666cbf9d1df045.pdf?index=trueIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_fb8b4ca340fa4964b2a8df0b320f66bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2331ceba-d035-45ef-9ea1-f72f86aa95f2/6575201571.pdfIn PDF document text
    • https://8ab8d0a6-ebcf-4503-ac90-3c5d9a0926ce.filesusr.com/ugd/8585d4_227385e4621a4377ab036614292fdbd8.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_off0000e169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE169 5128 bytes
SHA-256: 8adb7aa47ddd00badf5bde8efc3762c407c0c392b0ccefed42404b53957c58c1
font_01_sfnt_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 11764 bytes
SHA-256: 61f139aa74371a885a7bf3492d983916749af7ce5e5feabcd0a3e708e46ad0d5

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