Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54b2227221da375…

MALICIOUS

PDF

84.3 KB Created: 2021-02-22 08:45:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4de60a124cf612a718eeecb0c30b792c SHA-1: 2acce3d2237f8c8dcb8ccc94f5b36968f4ce3ff2 SHA-256: f54b2227221da3759bebaa75d7dcd3e469e3b7eba2047f12d3f619d4f2298f11
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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, many hosted on disposable domains, suggesting it is part of a link farm designed to drive traffic to other sites. The embedded URLs and the document's apparent purpose as a lure (e.g., 'area of shaded region worksheet answer key') point towards a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://maypoin.ru/wix?keyword=area+of+shaded+region+worksheet+answer+key PDF link annotation
    • https://sozazajigosana.weebly.com/uploads/1/3/0/7/130739782/senetilizanojaz.pdfIn PDF document text
    • https://cdn.sqhk.co/jisepozidis/6Ojbm8J/82989912079.pdfIn PDF document text
    • https://cdn.sqhk.co/wovupeni/6ggiu9a/83639226340.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448980/normal_5fe3e8b132705.pdfIn PDF document text
    • https://nagiwavimev.weebly.com/uploads/1/3/4/6/134612684/wimozelizewir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415525/normal_60167f0a98afa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453327/normal_60250e5ef1386.pdfIn PDF document text
    • https://cdn.sqhk.co/luwonowuwig/UgcS1pn/fefunazimomi.pdfIn PDF document text
    • https://cdn.sqhk.co/moxulofilose/hgksVhc/32964381637.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/kghhfB8/plants_vs_zombies_heroes_mac_download.pdfIn PDF document text
    • https://wisenuru.weebly.com/uploads/1/3/1/8/131856959/goxunaton_tuxob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476011/normal_60135d1a5dbdf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528915/normal_5ff1493b2921d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417321/normal_6032d8bf2ba08.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jeparilusukopof.epizy.com/hostgator_web_design_templates.pdfIn PDF document text
    • http://latisikonif.epizy.com/fifelisipidaf.pdfIn PDF document text
    • http://dizavinizekabos.rf.gd/92732769469.pdfIn PDF document text
    • http://gonidiwofove.epizy.com/13312441197.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10328 2828 bytes
SHA-256: dd7b880f1c6958317b71933e3175eb4154b1281d355b69180e4ce829e506ee21
font_01_sfnt_off00010d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D22 5384 bytes
SHA-256: 18401a118a7484cc68d8635f21b9e7a7a8b0346c07313504f694f6ec60e4c561
font_02_sfnt_off00011f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F85 9992 bytes
SHA-256: cd1689eae75501afe50874d5b932de20aeba315c3898ccae6de6b81324f857d8

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