Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee72c755d6a7c670…

MALICIOUS

PDF

87.6 KB Created: 2021-03-14 21:15:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4f956223d5df6123b545f5e053846af SHA-1: 232c0e286b34650c8fea77cc6703d2a5aad58820 SHA-256: ee72c755d6a7c670e45305ea311c4b67db9b9ea2a518c7aeeb62ecd01b757574
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious phishing content. It contains a large number of external links, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, appears to be related to 'Ash 2020 registration', likely a lure to encourage users to click the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://soxebez.ru/wix?keyword=ash+2020+registration
    • https://jikevisanudopud.weebly.com/uploads/1/3/4/0/134017539/4515005.pdf
    • https://cdn-cms.f-static.net/uploads/4469631/normal_60150edc64a31.pdf
    • https://static.s123-cdn-static.com/uploads/4393790/normal_5fc86283e9367.pdf
    • https://zegazofegu.weebly.com/uploads/1/3/5/2/135296009/tofexesanu.pdf
    • https://bajarewejewud.weebly.com/uploads/1/3/4/6/134673735/15f10d327.pdf
    • https://cdn-cms.f-static.net/uploads/4388432/normal_601331fbb9ed7.pdf
    • http://bekowakiged.iblogger.org/apa_reference_guide_multiple_authors.pdf
    • https://cdn-cms.f-static.net/uploads/4392871/normal_60206ebda5717.pdf
    • https://wezenazuzive.weebly.com/uploads/1/3/4/7/134764498/398459.pdf
    • https://xubidanata.weebly.com/uploads/1/3/4/8/134895671/taziwubowixomif-lobefapakem.pdf
    • https://static.s123-cdn-static.com/uploads/4417834/normal_5ff2ac3320108.pdf
    • https://jawifeguviweti.weebly.com/uploads/1/3/2/3/132302916/6206566.pdf
    • https://jomufoxubibad.weebly.com/uploads/1/3/1/1/131164047/wutitekomerifidubus.pdf
    • https://gavebinakufir.weebly.com/uploads/1/3/2/3/132302735/tonemozevopala.pdf
    • https://static.s123-cdn-static.com/uploads/4483855/normal_5fe44fd25ecaf.pdf
    • https://minomawisagu.weebly.com/uploads/1/3/5/9/135956859/7add31b94cea.pdf
    • http://ruroraratotu.66ghz.com/pifexitutikajalaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_b0c16ca1a32344be93163da359573e30.pdf?index=true
    • http://demumerip.rf.gd/vamijividizikidenozaga.pdf
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_25de5158f85146c58e5a04adadd9551b.pdf?index=true
    • http://lelexuxifu.epizy.com/clothes_matching_esl_worksheet.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117fe.bin
6b4b083015b13acd4e718dc38bddb7ea279ae4aa64eb1fc3625b08bde81c1a92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117FE 5176 bytes
font_01_sfnt_off00012997.bin
be21eabf882e3cfa94699e2ebc0890f4b609a162825f876cbf21d09eb7b28ca9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12997 11560 bytes

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