Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc01f94af4392a9…

MALICIOUS

PDF

82.9 KB Created: 2021-02-12 07:11:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 891f92e6db9021ebbf52a9201d3ff03f SHA-1: 905e1551113f11e76de2aac02c5e125531255fc0 SHA-256: afc01f94af4392a99dbad7b1d51d6dbcfb501fe92d9d0827c70a00e534db85da
194 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing operation. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, with the embedded URLs likely serving as the primary mechanism for delivering further malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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=transformers+robots+in+disguise+mod+apk+latest+version PDF link annotation
    • http://momentshop.website/world_cup_2020_schedule_time_tableidmip.pdfIn PDF document text
    • https://jovanifapekiba.weebly.com/uploads/1/3/0/7/130739678/e2f796.pdfIn PDF document text
    • http://pumujavebedopa.iblogger.org/elmira_ny_weather_report.pdfIn PDF document text
    • https://winugemu.weebly.com/uploads/1/3/1/0/131070294/5362c20d098.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422912/normal_6013e8bb21959.pdfIn PDF document text
    • http://instahelpforbusiness.com/car_racing_games_for_nintendo_switchfwkps.pdfIn PDF document text
    • https://gezajinesobovu.weebly.com/uploads/1/3/2/3/132303035/4714700.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377663/normal_5ffa22e10c90a.pdfIn PDF document text
    • https://satizivuzaked.weebly.com/uploads/1/3/4/3/134383512/poxaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393359/normal_6008aa98db2f3.pdfIn PDF document text
    • https://duparumiwope.weebly.com/uploads/1/3/4/7/134707207/kegiledazifosa_lexuzomikaga_sazik_favifi.pdfIn PDF document text
    • https://ribebofav.weebly.com/uploads/1/3/2/6/132681502/gepuvaxesato.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xezujuxoz/hoodsport_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/platformio_ide_atom_dependencies.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/mizawafogakutizire.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10F 5456 bytes
SHA-256: 0ff054feeb8420e2b05e8f9b46a819c4aea75491c498b4351829cb95ea2483ef
font_01_sfnt_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 11948 bytes
SHA-256: 2f333160f54ad1f7ebc62c776e42a4e718dd38774348bd57945f906cb8057ddb
font_02_sfnt_off00011ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB2 16060 bytes
SHA-256: df1d2c903cabdf2976887e260da0b25217edeb5ce2b71f315001024534e8e210
font_03_sfnt_off00012f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F48 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34