Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8dac69434f0b2a…

MALICIOUS

PDF

70.6 KB Created: 2021-02-14 04:38:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b05c130789e72d2a0fd9726d88c2b8a SHA-1: db1ffc5b71a37832db9d482627633f7bdc396dd1 SHA-256: 8e8dac69434f0b2a1fe2015478e57e1f1acdefa79ae6ad6129f7c44af618d103
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a PDF link farm, designed to direct users to various websites. The primary URL, https://seumenha.ru/wix?keyword=why+does+juliet+want+to+kill+herself, appears to be part of a SEO-based lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/wix?keyword=why+does+juliet+want+to+kill+herself
    • http://itrom.fun/33328574423e07um.pdf
    • https://sojenumodab.weebly.com/uploads/1/3/5/2/135296615/losopabam_zunawejobi_zagakelune.pdf
    • https://modovepa.weebly.com/uploads/1/3/4/4/134464072/5891228.pdf
    • https://cdn-cms.f-static.net/uploads/4495240/normal_600d875ccfae8.pdf
    • http://salonop.xyz/fefusavobemomevavafat7foi.pdf
    • https://nomomiwadij.weebly.com/uploads/1/3/3/9/133997716/manuraniset.pdf
    • https://tiruvodeg.weebly.com/uploads/1/3/4/8/134892329/lixotofido.pdf
    • http://wildboost.club/macrame_plant_hanging_patternsj3ewj.pdf
    • https://mepalowe.weebly.com/uploads/1/3/1/0/131070826/209981.pdf
    • https://static.s123-cdn-static.com/uploads/4445557/normal_5ff994cf43e8f.pdf
    • http://becloud.website/62596952366eo8l2.pdf
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/femozuxasel_ragonexuwi_zamozazajomi_wosud.pdf
    • https://bumiwawewa.weebly.com/uploads/1/3/5/3/135343946/lodulijuxepolamixer.pdf
    • https://lelunoforonu.weebly.com/uploads/1/3/1/6/131606056/1617127cb1b5c37.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nakulijotozun.rf.gd/caslon_ttf_free.pdf
    • http://dovagoxaluzof.rf.gd/equation_of_a_circle_general_form_example.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bed9.bin
0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBED9 6744 bytes
font_01_sfnt_off0000cfc0.bin
f973abad2cf2c9f17a910a14c5782fa246937b872316651049c349b63dcd7e54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC0 5340 bytes
font_02_sfnt_off0000e202.bin
32a6c9cf4067d7fa5621a49dc8d8d8972c3f279f3546515ffc20f8c84f99a136		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 1828 bytes
font_03_sfnt_off0000eafa.bin
f6169c7aca0fe13ae22da10894a27cf9aa7d6241b99747a246182ebaddabf400		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFA 9896 bytes

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