Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc6b5208a214681…

MALICIOUS

PDF

85.2 KB Created: 2021-02-19 03:42:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ed3775a913b782a84881fc7605983891 SHA-1: add22596b6edc8d9a816777e28041b0e3ef8d9c7 SHA-256: 3fc6b5208a2146818ccbfb1ccb7dcbba76edb25d7406b2719ed2dd5f5661c95c
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://crophysi.ru/wb?keyword=how%20to%20work%20out%20volume%20of%20a%20cylinder%20tank`. This indicates the document's primary purpose is to lure the user to a potentially malicious site. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of PDF redirects often involves embedded JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • 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.
  • 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://crophysi.ru/wb?keyword=how%20to%20work%20out%20volume%20of%20a%20cylinder%20tank In PDF document text
    • https://cdn.sqhk.co/rorajakura/gyjjqjY/tap_the_baby_frog_doodle.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372073/normal_6006d86d17c20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427514/normal_5fe8adf9ef5ad.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/jgcHDhe/pewdiepie_merch_dbrand.pdfIn PDF document text
    • https://cdn.sqhk.co/devurekon/abvXhf4/luke_bryan_wife_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/aTaighh/v40_thinq_wireless_charging.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379839/normal_5fd83e5f7719b.pdfIn PDF document text
    • https://cdn.sqhk.co/kenipafitu/f3tihhf/merchant_marine_academy_football_coaches.pdfIn PDF document text
    • http://beliyden.xyz/97516735974uer54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495838/normal_601a4f7e92359.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492892/normal_6010c4f256bd8.pdfIn PDF document text
    • https://cdn.sqhk.co/kesumixom/hCpdhg5/1801723877.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384645/normal_5fcd87c22e035.pdfIn PDF document text
    • https://cdn.sqhk.co/rinovizifim/0gh4jij/5248764107.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417321/normal_5fc6bfc2453e3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sojidalome.rf.gd/raizes_do_brasil_buarque_de_holanda.pdfIn PDF document text
    • http://rotitow.rf.gd/biwavamezol.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_off0000d9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BB 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off0000eaa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA0 5268 bytes
SHA-256: 0cdd0882ed334aa658126b4b32e5350fa82a2fa54bd5f5258e8dccbc146c7bee
font_02_sfnt_off0000fc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC88 3040 bytes
SHA-256: 2b27549a550940f726bce232d10ccc5386f855464d3a56b366fb8a41791c6f5f
font_03_sfnt_off000108fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FB 11280 bytes
SHA-256: cf6cf0679f43b5654f9bdfa33b07da6c18a44c847179419b6855db5edd49f161
font_04_sfnt_off00012fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD9 16636 bytes
SHA-256: 7229a7a2488edc6fb475ad8160fe782ab4d757d17b3a2e3dd042f5fa6a531aad

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