Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c3d408c29d6e48b…

MALICIOUS

PDF

73.9 KB Created: 2021-03-27 20:40:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7e1740177e9ae2e72394f5525410cd32 SHA-1: 1d609e2d86a0d19b012ba8e0b95806abb3a725b6 SHA-256: 7c3d408c29d6e48bda1af6fba08d84b640154e0d42b0f30749db0c6bd36a1968
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and flagged as redirectors to malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, appears to be a lure related to academic materials, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://yafferge.ru/award?keyword=psu+books+for+computer+science+pdf In PDF document text
    • http://opensol.xyz/gemopoxezeweiy0f.pdfIn PDF document text
    • http://ceter.xyz/31851439294v075y.pdfIn PDF document text
    • http://puliliraforuwu.22web.org/tasujan.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/56914003195w5jv6.pdfIn PDF document text
    • http://betizekaxu.getenjoyment.net/15115101356.pdfIn PDF document text
    • http://tujemet.scienceontheweb.net/mesemepo.pdfIn PDF document text
    • http://witikotuxigere.scienceontheweb.net/mosuwudagos.pdfIn PDF document text
    • http://b4shop.icu/canon_mg5620_driver8piom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_440a67d8032242a78c68ea06ef23ab6f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/19394119952.pdfIn PDF document text
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_695f64e3ce5d4d69b9cf24108e718f31.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_3c72f14a49d74a58a09cc209911b30f2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xupimaral/free_printable_recipe_card_template_for_word.pdfIn PDF document text
    • http://gekavitominugi.epizy.com/41087496147.pdfIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_ccbf42f4fbaa4597ae2d0e0d22db8388.pdf?index=trueIn PDF document text
    • http://mipesijelu.rf.gd/a_thousand_years_song_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/interior_design_basics_book.pdfIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_b3fb077d17f04afa8093e5d5257fcf24.pdf?index=trueIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_1e23ff05988e4d14a62e8b7c8adcc46c.pdf?index=trueIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_dd06183ce10748a98613b4d1a2667bc0.pdf?index=trueIn PDF document text
    • http://gapoxuvopa.onlinewebshop.net/bosch_mum6n10uc_universal_plus_stand_mixer_800_watt_6.5-quarts.pdfIn PDF document text
    • http://xidozex.epizy.com/51021957067.pdfIn PDF document text
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_3b809f6c4ff44ea29d5da8c952aed740.pdf?index=trueIn 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_off0000e274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE274 5264 bytes
SHA-256: 766bf874c1aa9a8720675bbcec7b5b47beb458edc34eaf5cae03d29f350a2529
font_01_sfnt_off0000f446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF446 10996 bytes
SHA-256: 5c6eda73777eb1b535e1b62290347bdf8dbce0f0a8810f77d9b5306b02e19400

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