Malicious PDF — malware analysis report

Static analysis result for SHA-256 73736cf27d7c6cb5…

MALICIOUS

PDF

76.2 KB Created: 2021-03-20 15:51:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f606023e8181d47e70bda1ad434c486 SHA-1: 7b105c31bcda47ca21fbb21ef80a02898429042e SHA-256: 73736cf27d7c6cb527a62d43159454296192532656931ce732a6ec16607a793f
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'psychology books', likely designed to trick users into clicking malicious links for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=top+psychology+books+2020
    • http://wedidizelajat.mypressonline.com/peripartum_cardiomyopathy.pdf
    • https://cdn.sqhk.co/rutesawir/YNibBgd/86690163199.pdf
    • https://cdn.sqhk.co/nanijamu/Bjddb73/mirafimugowelazimeva.pdf
    • https://cdn-cms.f-static.net/uploads/4411229/normal_60168b2f841ce.pdf
    • https://cdn.sqhk.co/gavezexu/uhggggi/rebel_inc_cheats_android.pdf
    • http://gigezesuzobe.getenjoyment.net/28566808417.pdf
    • https://static.s123-cdn-static.com/uploads/4426085/normal_5ff6353d8bc9f.pdf
    • https://cdn.sqhk.co/soxuvezosapa/bmjiibH/office_space_bosses_quote.pdf
    • https://cdn.sqhk.co/luwagoma/Gjgfhhv/thyroid_nodule_management_guidelines.pdf
    • https://cdn.sqhk.co/tezofugowura/fgcieig/my_land_is_your_land_lyrics.pdf
    • http://fuxezaboxekave.scienceontheweb.net/holy_quran_english_translation_download.pdf
    • http://vitofemegawe.getenjoyment.net/gulozuwum.pdf
    • https://static.s123-cdn-static.com/uploads/4366306/normal_5fe386193020a.pdf
    • http://mejuzuw.scienceontheweb.net/8885405428.pdf
    • https://cdn.sqhk.co/durotula/jchijcE/posarowijotawexuvum.pdf
    • https://cdn.sqhk.co/duxadikoti/iexuBBe/96405638108.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_bf5b5a8967ba4d2ba038c85af174ec4c.pdf?index=true
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_cbc7ea6e450f446b90654f774ca5a649.pdf?index=true
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_f36f0bf746224cf9b69377295f66bfb1.pdf?index=true
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_2822047486e14ef58b23eaa5de0370e5.pdf?index=true
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_39d39a9be54646218eff1e55303b6954.pdf?index=true
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_69180236a37c4657a825162959126472.pdf?index=true
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_88825b471c484a768c05d16cde7b7508.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed4c.bin
fc579b5332a9f469cc9cfa42bc031ec516d80657cc323696dabc5515bbda2ed0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 5416 bytes
font_01_sfnt_off0000ffce.bin
7495bbd7a249eddfec9ec5e14291f3b85e2cb1266e51ad3fd16177a005c210fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCE 10408 bytes

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