Malicious PDF — malware analysis report

Static analysis result for SHA-256 45df197b8ba6f70b…

MALICIOUS

PDF

74.3 KB Created: 2021-02-25 10:35:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9d41fb4f769918e9ae0f8fd2fd23508c SHA-1: 73dc5ecb83df388e83a554ebf747c8f9020c4ec0 SHA-256: 45df197b8ba6f70b2433e0295fb57b2fabe0d148112d54e7a4c32672ed78e099
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://leonvi.ru/123?utm_term=what+is+kx+modifier+for+dme PDF link annotation
    • http://wejowadizabudex.mypressonline.com/house_on_the_hill_lyrics_lil_skies.pdfIn PDF document text
    • http://sesopob.iblogger.org/sheets_for_ingenuity_bassinet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476015/normal_6027a62ef0064.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388162/normal_5feb42c9ce9f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406806/normal_603747765fe16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386074/normal_5fd2a5b8e763f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://molumazorok.rf.gd/vamerazota.pdfIn PDF document text
    • http://pozirumine.epizy.com/73730165693.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/5343003941.pdfIn PDF document text
    • http://bazimiguzanuv.rf.gd/83321667291.pdfIn PDF document text
    • http://nejoselox.epizy.com/olympus_om-d_em-1_mkii_review.pdfIn PDF document text
    • http://vulebodifoguvar.epizy.com/how_to_thread_bobbin_brother_lx2500.pdfIn PDF document text
    • http://purupuladufuba.rf.gd/5984505030.pdfIn PDF document text
    • http://gamemogap.epizy.com/nedefumebifubazatezug.pdfIn PDF document text
    • http://womunek.rf.gd/ghouls_osrs_slayer_guide.pdfIn PDF document text
    • http://tuninedup.epizy.com/76564450132.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC9 3320 bytes
SHA-256: 0cde0448afeef984f54caece15f490841e71d647734c4e4bd1e27904f8030275
font_01_sfnt_off0000d795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD795 5260 bytes
SHA-256: 7d7afa2023facb251a5a318aab495a0813bf68c85b604f2c7a602ed78cb07ad0
font_02_sfnt_off0000e958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE958 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_03_sfnt_off0000f4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BB 11276 bytes
SHA-256: 767772708ece91ad765e261bdff231b3e08a64c27d0ddb90b3e7f3ee61c9a890

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