Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9a5ba03a4d52ea…

MALICIOUS

PDF

73.9 KB Created: 2021-03-12 20:34:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 60a4bcb0a2f388aa06e87bba1d42c1b4 SHA-1: 52032eeba04164dee83c37b8ced43ee91b67d1af SHA-256: 3e9a5ba03a4d52ea418976d12610ffa6bdeb7bb4265df2f6357e084ab7be7b4d
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'spatial data analysis theory and practice pdf', likely a pretext to drive traffic to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/award?keyword=spatial+data+analysis+theory+and+practice+pdf In PDF document text
    • https://vowebaxuzifov.weebly.com/uploads/1/3/0/7/130738870/vefotiw.pdfIn PDF document text
    • https://jajadonafusava.weebly.com/uploads/1/3/4/0/134040597/wopoxiloje-remafa-jipezog.pdfIn PDF document text
    • http://lulelil.22web.org/kesagav.pdfIn PDF document text
    • http://silkhfig.bid/gopajirevexafaheoq8.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/f2486.pdfIn PDF document text
    • https://saxurugilura.weebly.com/uploads/1/3/2/8/132814125/bc72e5e6af.pdfIn PDF document text
    • https://serekarivevug.weebly.com/uploads/1/3/1/4/131407867/0d4df4f5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468554/normal_601efff42842b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386076/normal_5fe74f374224e.pdfIn PDF document text
    • http://espacecmb.xyz/pidizosawogabipizemazj2fm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452386/normal_601bae2785402.pdfIn PDF document text
    • https://gigotuvo.weebly.com/uploads/1/3/1/1/131164366/7801632.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec33c414-1279-4dbe-aaa1-1eaab5368274/what_does_hues_mean.pdfIn PDF document text
    • http://zekonumusew.rf.gd/96301206146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/531f7718-20b1-4646-a2c6-37fe9a385738/lasko_window_fan_home_depot.pdfIn PDF document text
    • http://xilibosukotijob.epizy.com/26168501840.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE531 5448 bytes
SHA-256: 8fcea09a6fddab4f5bfa4bfa58eb409601b1253a8f36ae83c5f187af918c8fee
font_01_sfnt_off0000f7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B9 10212 bytes
SHA-256: 0c09c9dc274219d4f7338a4090d067c0997a401e17dc5cdfc57d01803f45cea3

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