Malicious PDF — malware analysis report

Static analysis result for SHA-256 82441ccbe2a7c2f0…

MALICIOUS

PDF

81.7 KB Created: 2021-04-07 00:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffa675753ad214729175d6fd6cfb8787 SHA-1: 5fc656ddc9cb22d826cb25fe2b238e6c09c43598 SHA-256: 82441ccbe2a7c2f01ec9d624d88a50eec452e77eb4ca675db24633d3bb4db94e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the intent is to manipulate search engine results or distribute further malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 http://cicatsalud.com/html/sites/default/files/webform/kizosilubim.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/21555212736.pdf
    • https://www.newburghgroup.com/sites/default/files/webform/resumes/41319995155.pdf
    • https://www.newburghgroup.com/sites/default/files/webform/resumes/mogewewe.pdf
    • https://architecturaldesigninc.com/sites/default/files/vudezuluxi.pdf
    • https://ambrose.edu/sites/default/files/webform/bunovodedodasu.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/kafavepovimurajubek.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/31626011693.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/26688185713.pdf
    • https://www.jwico.com/sites/default/files/webform/23528315583.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/bidepe.pdf
    • https://ambrose.edu/sites/default/files/webform/natogaj.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/dapajinosez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=html+all+tags+pdf+download
    • https://community.princeton.edu/system/files/webform/40347257249.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/tuvoluxasivawujunaz.pdf
    • https://gradfutures.princeton.edu/system/files/webform/ninavixokamorul.pdf
    • https://printandmail.princeton.edu/system/files/webform/26360011081.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec6c.bin
ba1b36bf6d749cff4ea546000864939677cd8a31be1ff361d2f162a2331aec9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6C 5316 bytes
font_01_sfnt_off0000fe87.bin
bfb9958cebf62a53d16ddec805be6dce7fed4018f9d5c7f92f27acc6b162a358		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE87 12460 bytes
font_02_sfnt_off0001287c.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1287C 16204 bytes

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