Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb28d7e275e7bfd…

MALICIOUS

PDF

128.0 KB Created: 2021-02-25 22:19:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0689829cc954cbe14540ec0c583dcd68 SHA-1: 109bd0e9a9d9bd6db3337ec408f298409f2c31d5 SHA-256: ffb28d7e275e7bfd5a379daf7cb0c6f4240012e6af73d6bf89e07c41450cd1de
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous external URIs, many hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

Heuristics 5

  • 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.
  • 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://jottigo.ru/strik?utm_term=taylormade+r15+driver+for+sale+new PDF link annotation
    • http://xawegap.mywebcommunity.org/velisavenafi.pdfIn PDF document text
    • https://nagifinapu.weebly.com/uploads/1/3/2/6/132696111/7105219.pdfIn PDF document text
    • https://lurufabufukigo.weebly.com/uploads/1/3/1/4/131407807/2213853.pdfIn PDF document text
    • http://begemotiks.fun/xopadinopogefanewawuvux19xz7.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/videjubug.pdfIn PDF document text
    • http://retys.space/download_game_crowd_clash_moduck9p.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/present_perfect_subjunctive_spanish_exercises.pdfIn PDF document text
    • http://kosamaritaj.getenjoyment.net/21533020908.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/dilezetudekafurupidesid.pdfIn PDF document text
    • http://kipokefurur.mygamesonline.org/74376442540.pdfIn PDF document text
    • http://spindlndou.space/suffolk_county_pistol_permit_applicationjdhio.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/15808750684.pdfIn PDF document text
    • http://sutexuvidag.myartsonline.com/96624142036.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/mivev.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/pafarurusotosubuwevi.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001a35a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A35A 25572 bytes
SHA-256: f28eee0714006dc344e01f4092ed54f4a8cbb30dc898b014b03887624ee779d6
font_00_sfnt_off00010b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3B 12288 bytes
SHA-256: 51bb3e32ac482e3b89fc09969e8337143c041b9e9a075b077da6f941aaf30273
font_01_sfnt_off0001339e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339E 5140 bytes
SHA-256: e5f78744a2c5cbd38205ee17a4740ed69d3e91debf83e2f73d089e373d1e2e87
font_02_sfnt_off00014517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14517 8096 bytes
SHA-256: e978f32969433f877c4a1db8cbc925f078a9cd7b287dced4ae8f80d8474994ed
font_03_sfnt_off00015b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B9D 27720 bytes
SHA-256: 96d82830c63321142fc124041864f6a75b705d407c07295554340cd67030b6ee
font_05_sfnt_off0001cf5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF5B 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
font_06_sfnt_off0001dd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD5B 5444 bytes
SHA-256: 7532739f3f0b4af57c5471edd05bda23fce87d68479b252b73e524771ed7fbb6