Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c536b0a0299fe9f…

MALICIOUS

PDF

82.9 KB Created: 2021-03-29 06:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42ffa34707a6143ebf29e1c075158cd6 SHA-1: 3935969850d6a7590d3fb40b8ebf3b601239e0e5 SHA-256: 4c536b0a0299fe9f9f148c0e0674d7d147eb38b6dfa0a22bd59529f1a23f91da
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external links, with one prominent URL pointing to a suspicious domain, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/award?keyword=beijing+subway+map+pdf+download
    • https://cdn.sqhk.co/zidexamuwela/bgficif/gmail_inbox_sign_in_gmail.pdf
    • https://cdn.sqhk.co/xeduwukaxusa/Pcu55ic/histogram_line_color_matplotlib.pdf
    • http://dapibat.22web.org/70901740673.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://507f79ed-2408-4027-b124-45ed49bded7d.filesusr.com/ugd/2de61b_177673621d7c43fd8ff0b0fcb1fbc51b.pdf?index=true
    • http://lomigibowexalu.epizy.com/rebiwugul.pdf
    • https://7ce190f9-fb8d-496c-a51a-ce151dcc024a.filesusr.com/ugd/e72def_822011e40b7042439ae71f3ffed8d49f.pdf?index=true
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_d994f7d39d2a41958bcda94dec023fa5.pdf?index=true
    • https://40c507a3-37b7-491f-afd3-f28ba3af1fb2.filesusr.com/ugd/7f5264_8212bc6de29a4909a7293f83caeb902d.pdf?index=true
    • https://s3.amazonaws.com/jenagubadopi/why_is_my_duracell_battery_charger_blinking_red.pdf
    • https://s3.amazonaws.com/voropa/azure_devops_linked_arm_templates.pdf
    • https://s3.amazonaws.com/banula/virivuxiw.pdf
    • https://s3.amazonaws.com/vifusupegiza/clerk_of_works_report.pdf
    • https://s3.amazonaws.com/megodipewukitoj/pakistan_budget_2018_in_urdu.pdf
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_afd82f82cf7b44929cf032893efa3721.pdf?index=true
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_f25d368da1b54a4f8db76a0b9bf30f0f.pdf?index=true
    • https://s3.amazonaws.com/gopuze/concorde_crash_bea_report.pdf
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_52cb02de9f1441d98c43c5440f0ccf19.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012292.bin
962d84eeeb26fb955548323b9dc97564e6bde3be1c290d6caffc3807b2f2c731		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12292 18056 bytes
font_00_sfnt_off0000e93e.bin
cc6ae4ee96b382fa62b775406c7ac27ff747feab9060349105e2f75db221ea1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE93E 5724 bytes
font_01_sfnt_off0000fcd0.bin
878a6776695cd7ac4d12532b811c2a0c35b98a9a9bbea98117d84b7af695d6b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD0 11060 bytes

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