Malicious PDF — malware analysis report

Static analysis result for SHA-256 736a8c6123f60a9a…

MALICIOUS

PDF

85.8 KB Created: 2021-03-30 09:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 770dd52c46dc5c7c800889fe38320dcf SHA-1: 68ece08bae95777bfab861f2eaa407fa64c28694 SHA-256: 736a8c6123f60a9ab5b8f38992e8009a430ab71dcc1e177a10a7f00be618f71d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs with numeric slugs, indicative of a link farm for SEO manipulation. The primary URL suggests a lure related to 'biochemistry of cell pdf notes' to drive traffic to a malicious domain. 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://jumiwimov.ru/award?keyword=biochemistry+of+cell+pdf+notes
    • https://dibevapanowodi.weebly.com/uploads/1/3/0/7/130776811/25f9a339cde3f2.pdf
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/4071720.pdf
    • https://cdn-cms.f-static.net/uploads/4464313/normal_600ccf3c628b9.pdf
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/rogusevaxixuga.pdf
    • https://gofupadosu.weebly.com/uploads/1/3/4/8/134853885/virajelofi.pdf
    • https://vejarava.weebly.com/uploads/1/3/1/0/131070596/purenegodoruput.pdf
    • https://cdn-cms.f-static.net/uploads/4420434/normal_60430b2f6c6db.pdf
    • https://remurefovedelag.weebly.com/uploads/1/3/1/8/131860204/5908269.pdf
    • http://brettlockhart.com/panasonic_phone_with_headphone_jacke4ejd.pdf
    • https://cdn-cms.f-static.net/uploads/4401973/normal_602cd80a52101.pdf
    • http://bonmarket.site/healing_for_damaged_emotions_bookwkqbf.pdf
    • http://proita.space/tokumeniwikumevijuzaqfuaz.pdf
    • https://wabomojufodeze.weebly.com/uploads/1/3/3/9/133999178/bakebizileki-riwejo.pdf
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/lalizegi.pdf
    • http://verification-help.business/9411157732accey.pdf
    • http://f13x.xyz/timurokawmig6f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pirosisob/revozixumi.pdf
    • https://s3.amazonaws.com/jirebonudur/7133141262.pdf
    • https://uploads.strikinglycdn.com/files/eebc73f5-b90a-437d-90a2-9589b3280509/the_handbook_of_fixed_income_securities.pdf
    • https://s3.amazonaws.com/fotojipifuzitul/84632496810.pdf
    • https://s3.amazonaws.com/likerajatob/answer_key_fts_19.pdf
    • https://uploads.strikinglycdn.com/files/dbef0813-1443-454f-b1d5-a13c4d2adcf5/machine_learning_python_basics.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_off0001145b.bin
defa94640954873d898da1c41d9d6a7c2575e0549654838787eccad73eff7e84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1145B 5336 bytes
font_01_sfnt_off00012668.bin
a3c82184473e70b24460a625b490ec83e36f9d8f83074b006cde65540724c84d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12668 10432 bytes

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