Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6dcd7f536f2ec6…

MALICIOUS

PDF

92.2 KB Created: 2021-01-27 20:45:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 58cc687fcd099496fa626831518db48a SHA-1: b3435c41e0052f303b88a9a1f02a0d8b46dea712 SHA-256: 3d6dcd7f536f2ec600a1ea3311819d6ff436cdde8906c3a8d8808f2022c0e52e
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and a machine learning classifier, exhibiting characteristics of a phishing or link farm campaign. It contains a large number of embedded URLs, many of which point to disposable hosting or redirector infrastructure, designed to lead users to potentially harmful content. The document body, though obfuscated, suggests a lure related to educational worksheets.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://crophysi.ru/123?utm_term=precalculus+composition+of+functions+worksheet+answers+pdf In PDF document text
    • https://vujivizu.weebly.com/uploads/1/3/5/3/135305207/89e36d09c.pdfIn PDF document text
    • https://tonikajolokoge.weebly.com/uploads/1/3/0/8/130874266/govabufonevorademi.pdfIn PDF document text
    • https://gidixolatuloxag.weebly.com/uploads/1/3/1/0/131071157/6908c2645.pdfIn PDF document text
    • http://soxiwokix.iblogger.org/rutez.pdfIn PDF document text
    • https://zomerasojukoluw.weebly.com/uploads/1/3/4/7/134769652/2387741.pdfIn PDF document text
    • https://cdn.sqhk.co/potiribuwuf/bIRvhjv/monster_warlord_tap_warlord_deutsch.pdfIn PDF document text
    • https://dajadigab.weebly.com/uploads/1/3/2/7/132712332/8590006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418963/normal_5fe8e5fa61dd1.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/UAkhsvk/gofowufefof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470545/normal_5fe2cbf4aa3b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416675/normal_5fd9c90015d94.pdfIn PDF document text
    • http://vabapagamowese.22web.org/bumupejip.pdfIn PDF document text
    • https://zuveravovizopow.weebly.com/uploads/1/3/0/9/130969477/2da27a7022e.pdfIn PDF document text
    • https://repawuwo.weebly.com/uploads/1/3/5/3/135313919/jeroto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/after_effects_templates_3d_text.pdfIn PDF document text
    • http://jatomije.rf.gd/7812815731.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/steam_slow_for_no_reason.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/cancer_de_cervix_tratamiento.pdfIn PDF document text
    • http://radujexoxetapil.epizy.com/caslon_antique_free_font.pdfIn PDF document text
    • http://vowefaxi.epizy.com/occupational_health_and_safety_policy.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/51038713328.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11194 5552 bytes
SHA-256: f3d622565c2ecd51990d6646dc449241626a3c23a0878cd35b9a222dcc0e2d3c
font_01_sfnt_off0001245b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245B 11708 bytes
SHA-256: 4f2061cfffbce96ddb9f8e377e107c68b11b9bdbfb328df9cf12c33cb98c5a00
font_02_sfnt_off00014cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC7 16236 bytes
SHA-256: 07270020b4ef989e72d6f55cd3df7f4d59827cdf1cc36a15ee13646bc2eb4d75