Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0fd92574aa2a17…

MALICIOUS

PDF

117.4 KB Created: 2021-03-13 21:27:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d782c9acb96cacf5f38efc8dbf7ac97a SHA-1: df5c7bb5482909d997942e835809031a7b0639e8 SHA-256: 7c0fd92574aa2a17311b81f0900b505e03a83012ea24d23724230b05b9f36f35
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'Sinhala wela katha pdf download', suggesting a lure for potentially unwanted content that leads to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=sinhala+wela+katha+pdf+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4414691/normal_6016c4a732b09.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/BjhgVie/46036091566.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/dgjhgzo/basketball_hoop_drawing_side.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367286/normal_60077b0b01ec1.pdfIn PDF document text
    • https://cdn.sqhk.co/kogewole/jf3fjd1/kisasuvikegurakuzid.pdfIn PDF document text
    • http://grigolia-studio.ru/samsung_dishwasher_error_code_heavy_blinkingqmtz4.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/gg0oyJJ/automower_connect_app_windows_10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500911/normal_60037e8366244.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402940/normal_60480c281d8a9.pdfIn PDF document text
    • http://getdouche.xyz/300099799603lfek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467564/normal_60353cd32377b.pdfIn PDF document text
    • http://romabeveseruzor.22web.org/battery_monitor_android_phone.pdfIn PDF document text
    • http://wide-do.top/tadademepisilabazistbo4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482190/normal_600842751764a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380380/normal_603440ec0fa86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469370/normal_5fef540318e44.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/fJgcIjj/virus_protection_software_for_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/jiwosowo/gghgizv/prank_call_ryan_toysreview.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mupevisad.epizy.com/how_to_connect_polk_signa_s2_to_alexa.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://sinhala.sourceforge.net/In PDF document text
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITSIn PDF document text
    • http://www.gnu.org/licenses/gpl-2.0.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11667 5116 bytes
SHA-256: 95bd5bc8db6945e3d5ac27e70a50ee19af163f5a4ddf87d0eb5f606274009b5f
font_01_sfnt_off000127a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A4 55904 bytes
SHA-256: 7ad5494851bfff8b7fd630179ca4f0e07cc71e5eeddc7e5b5ec596fde098adf0
font_02_sfnt_off00019cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CF5 13344 bytes
SHA-256: bd9d25ebf09b1a5175b2848fb1585bdf7a1b011a8a2072771fcff3d693080764