Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f6507a6d9231c0…

MALICIOUS

PDF

91.4 KB Created: 2021-02-19 22:06:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: c08f637980a828ac586dd9579d46a9fa SHA-1: 36578cd9ce2c788014a9e3d0fffa2d84ea190af7 SHA-256: a5f6507a6d9231c097116b997cfc92e0530c81136d0ea264d9393b8bbe388b0c
134 Risk Score

Malware Insights

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

The PDF document contains an external URI pointing to a download link for 'bigo live apk for android'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature. While no scripts were extracted, the embedded URL and link farm characteristics strongly suggest a phishing lure for application download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=download+bigo+live+apk+for+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383160/normal_601bb34ad6943.pdfIn PDF document text
    • https://nusutaligufobam.weebly.com/uploads/1/3/5/3/135393176/ketixikin.pdfIn PDF document text
    • https://fajasorefasox.weebly.com/uploads/1/3/4/3/134348900/5679846.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497638/normal_5ffd67c1e7f75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_5fd23995be8a7.pdfIn PDF document text
    • https://leduzurukidep.weebly.com/uploads/1/3/4/8/134858842/135070caaa74b83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417534/normal_5ff9e69d774dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422163/normal_600025a5318b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443809/normal_5fe009265d89a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499958/normal_6004d9ef38a7f.pdfIn PDF document text
    • https://lugijuvumefabi.weebly.com/uploads/1/3/4/7/134761930/bf9c83b7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466151/normal_5ff61aef082b4.pdfIn PDF document text
    • http://trujillostacoshop.com/mario_kart_8_deluxe_guide_books4sl8.pdfIn PDF document text
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/jaxininapi-sitiwol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sewosugopig.rf.gd/intro_to_psychology_college_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/brian_tracy_maximum_achievement.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/bumisaratuga.pdfIn PDF document text
    • https://s3.amazonaws.com/masevewi/96208737195.pdfIn PDF document text
    • http://xarozimazog.rf.gd/add_drop_down_list_in_word_template.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 6588 bytes
SHA-256: b3260a8b27c40a1c9408c40b3dcfb9ec9ded560232013cbc1ca8de37ebb5a831
font_01_sfnt_off0000fe39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE39 5384 bytes
SHA-256: df276d55583854a7909dad8b1cdde3d226e2ffb86c1d25b3ee0c7daa0b54ac6c
font_02_sfnt_off000110b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B8 4116 bytes
SHA-256: 82f01c6da2aa5cf44017d5389130f0b190b162916d2e2dd83f60b87b14c8574e
font_03_sfnt_off000120d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D9 13704 bytes
SHA-256: 1e37b096dad31d10777dcb92145cb7c7af079d5ca2abacd52c73b817b72121cd
font_04_sfnt_off000149bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149BB 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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