Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd37d31c29bb9b4…

MALICIOUS

PDF

80.6 KB Created: 2021-02-18 04:55:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49eefccc5b44310a6fee274957c5efa7 SHA-1: 135de4e1330a0cad92e52bf4e1bbc640edaf3577 SHA-256: 8fd37d31c29bb9b4cb07b19d42b38ebc5b987765e3a0db1122cc7c459f25182d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt, with one URL pointing to a potential malware download. The document body, though heavily obfuscated, appears to be a lure related to educational materials, likely to trick users into visiting the malicious URLs.

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://bologen.ru/wix?keyword=diffusion+and+osmosis+crossword+worksheet+answer+key
    • https://rolafaxamowoti.weebly.com/uploads/1/3/4/9/134903079/guwomitimoxajiwum.pdf
    • https://cdn-cms.f-static.net/uploads/4476566/normal_602c7bdc793b0.pdf
    • https://cdn.sqhk.co/gubisagebuto/gegMhhf/75459606669.pdf
    • https://cdn.sqhk.co/vowibesep/9Rjb8cf/centurylink_phone_number_boise.pdf
    • https://talotemeve.weebly.com/uploads/1/3/1/6/131606578/juvalurilivu.pdf
    • https://laludigulasi.weebly.com/uploads/1/3/1/4/131437637/werugowez_supirulevu_kodawati_divusenadisev.pdf
    • https://cdn.sqhk.co/dekavaka/LihIhgF/81458868317.pdf
    • https://cdn.sqhk.co/jogowijalaro/ekge1PP/greatest_hits_r_b_90_s.pdf
    • https://lolijizaw.weebly.com/uploads/1/3/4/4/134461821/favaxab-vilabesigugibet.pdf
    • https://static.s123-cdn-static.com/uploads/4381105/normal_5fee9ebe88c51.pdf
    • https://pitatulepuz.weebly.com/uploads/1/3/2/3/132303378/kusajalisariwirim.pdf
    • https://gizomedapirev.weebly.com/uploads/1/3/1/4/131454265/2131727.pdf
    • https://felekiki.weebly.com/uploads/1/3/4/6/134689652/2015495.pdf
    • https://cdn.sqhk.co/zamokaxu/rUBNqjb/the_labrant_family_newest_videos_2020.pdf
    • https://static.s123-cdn-static.com/uploads/4414682/normal_5ffe5208bdc57.pdf
    • https://fuvapele.weebly.com/uploads/1/3/0/7/130738919/mefumijafivilepoti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000fcc9.bin
aae04a6f7f0640c6dcf60979cc1e345a8be1d1537bb8a45a60b2d07aae665242
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC9 5484 bytes
font_01_sfnt_off00010f6c.bin
f0b400f720a72088be8caf054d0db6036be3f06342ca8f44f7d6c25ec714f28f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6C 10412 bytes