Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eb3169f73c54ba7…

MALICIOUS

PDF

82.4 KB Created: 2021-04-01 07:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0b1d57bf625271734fd8028088f70778 SHA-1: da0fec7ce4a956a7d2b2b910a027dac278b3641d SHA-256: 6eb3169f73c54ba7e4ddb4f55c596e276b518ddc35b3381b37b0570e63aa8e31
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links, many pointing to redirectors and SEO link farms, indicating a phishing or malware distribution attempt. The primary malicious URL identified is 'https://crophysi.ru/strik?utm_term=canon+p170-dh+paper', which is flagged as a malicious redirector. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=canon+p170-dh+paper In PDF document text
    • https://static.s123-cdn-static.com/uploads/4420911/normal_5fc9cb9b3eff6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477147/normal_5fd665cf0fb14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417664/normal_5fef8bde2bb6e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_ed3358b988494e53a4aedff08a26ad08.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jovekus/96470910314.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/88121760675.pdfIn PDF document text
    • https://b3159766-6c8b-4733-a97d-e59ef6783693.filesusr.com/ugd/21851e_313b360871fb4419bb5b797c5f47336a.pdf?index=trueIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_3953e1e314e946f792c8669c3a3905e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gumagabu/antagonistas_da_vitamina_k.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/monegexoje.pdfIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_dd46e876946e4fff92efee1f4deef7bb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/65160723968.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/wasezokarin.pdfIn PDF document text
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_7513b4ded0ab433a937c0858344afd5c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/28845678947.pdfIn PDF document text
    • https://s3.amazonaws.com/kotidox/best_gameboy_emulator_games_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/vegugetovexazufosib.pdfIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_c14fed419c9246c6a0bd5bb288a691a9.pdf?index=trueIn PDF document text
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_53c2c9c714b9412fb80651704ed65eae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/how_to_setup_hitron_cgnm-2250.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_off0000f5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FE 4824 bytes
SHA-256: cdea1049b5ce1f54fdb4a813882aac30ab100f00a9ac591106cabff2393092e8
font_01_sfnt_off00010663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10663 11316 bytes
SHA-256: ff7b9dcb76d737d38fd4438fc2d2dd6e74d297521b4076618f626079aa2d75f8
font_02_sfnt_off00012ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE1 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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