Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7ba0674e9af6ba…

MALICIOUS

PDF

76.4 KB Created: 2021-02-21 08:41:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97e1fab0db526d736289a2a305329af5 SHA-1: e7c0cf95acae7a9f5df0ca01f8b5f4cd4b483a42 SHA-256: fb7ba0674e9af6bac307420d50b6cd053b313c62dd8b1e62112e1037c2df2665
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to Weebly hosted PDFs, suggesting a link farm or SEO abuse tactic. One of the extracted URLs, https://leonvi.ru/wix?keyword=battle+monkey+apk, indicates a potential lure for users searching for specific content, likely to redirect them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=battle+monkey+apk
    • https://tokemenar.weebly.com/uploads/1/3/4/3/134337898/9888576.pdf
    • https://mitabepomumo.weebly.com/uploads/1/3/1/8/131872015/8991210.pdf
    • https://gitokivoj.weebly.com/uploads/1/3/4/3/134316846/pagodatukon-wajubupas.pdf
    • http://arthromedshop.xyz/girasatud9e7be.pdf
    • https://biwoponafi.weebly.com/uploads/1/3/4/7/134767969/lotibe-babupubibuda.pdf
    • http://geekcods.com/726790283734w7mc.pdf
    • http://form-lnstagramcopyrightservices.com/carx_drift_racing_2_hack_ios_no_jailbreakw0g2k.pdf
    • https://livubefelamujir.weebly.com/uploads/1/3/4/8/134899239/178774ab9f0.pdf
    • http://onsideball.info/smtp_mail_tester6p9aq.pdf
    • https://ramokazadi.weebly.com/uploads/1/3/4/4/134470245/samataraw.pdf
    • http://about-igsupport.com/tuba_city_chapter_house6hjl2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tedowafomaru/sivapitilanexekilirofux.pdf
    • https://s3.amazonaws.com/bezegoluzose/princess_and_the_frog_game_for_android.pdf
    • https://s3.amazonaws.com/pululusodogi/62554933033.pdf
    • https://s3.amazonaws.com/vapelurowar/classic_nursery_rhymes_lyrics.pdf
    • https://s3.amazonaws.com/wejuvono/crib_sheets_toddler.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ceae.bin
5f03d2c6bc08d28d18892b3fd5153044a2fff6aad81dd629dfd07635bf6cf50e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAE 2880 bytes
font_01_sfnt_off0000d8eb.bin
7c54c6e08b6bbe1fd0e5709c1c255c9facce90271c8e6f889986b1f7c9825c72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EB 4908 bytes
font_02_sfnt_off0000e99a.bin
5df9755f635dff9eb44629c40e66876b99dcae48d3c425493f4923a5e5be3e6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 10532 bytes
font_03_sfnt_off00010dd4.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD4 16092 bytes

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