Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa83c1efe4c8fab6…

MALICIOUS

PDF

73.9 KB Created: 2021-02-27 20:07:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2efb102c7bfc8d2154c329c57b0c92a0 SHA-1: 613385b0b0f8fd959286fe99e30e4e9aacadb74a SHA-256: fa83c1efe4c8fab6879637dcae9c1a21d3b55a368b4e2d2cbc0980f7530e180e
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of phishing and social engineering. It employs lures to trick users into installing browser extensions or executing commands via copy-pasting into a shell, indicating an attempt to compromise the user's system or steal credentials. The presence of multiple external URLs, some pointing to disposable hosting, further supports its malicious intent as a potential distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jacksth.ru/strik?utm_term=what+bean+has+the+lowest+amount+of+carbs PDF link annotation
    • https://jetovalanowu.weebly.com/uploads/1/3/0/7/130739462/6410980.pdfIn PDF document text
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/difexudid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388611/normal_60109b6076626.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497372/normal_5fda607b3dd87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501962/normal_600fa063ee35d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405467/normal_602453b9698f6.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/descriptive_essay_examples_middle_school.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454984/normal_5fe8f21333602.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/35574151645.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495395/normal_6003b4172e05f.pdfIn PDF document text
    • https://rowigoto.weebly.com/uploads/1/3/0/8/130813427/b66dbe81a18b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://japinoxizidunub.myartsonline.com/chrome_adobe_flash_2021.pdfIn PDF document text
    • http://nuluwajewugutik.onlinewebshop.net/viking_female_warrior_names.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/football_goal_size_guide.pdfIn PDF document text
    • http://badamowafe.onlinewebshop.net/what_is_old_country_music.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_off0000e22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22B 5368 bytes
SHA-256: 5c0fdb687bf87c78f621d65149fbcffd9123adf604456a924aeed743e26b9bde
font_01_sfnt_off0000f459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF459 11336 bytes
SHA-256: f39df3ec64fcdc96b8d3884cebd74a784085afbb7abd429bd14d67aa9034f46f

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