Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e9423ca2ddfcd3…

MALICIOUS

PDF

85.4 KB Created: 2021-03-23 22:42:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a67348eed98acf025fe937b4facead53 SHA-1: 860a42b05dea65571332cca915ca3af693783832 SHA-256: f2e9423ca2ddfcd31fcf0a0fd461da6a433600cfbc0915424c061833a1abd577
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://xajibur.ru/strik?utm_term=med+surg+hesi+2020+practice+questions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449192/normal_5fee627658afa.pdfIn PDF document text
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/tasodo_vexekefepi_mizadajeni_mifutadawutoji.pdfIn PDF document text
    • https://xudujebu.weebly.com/uploads/1/3/6/0/136090205/sibomiwa-fovafixevaxel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375528/normal_5ff5bc2f81748.pdfIn PDF document text
    • https://cdn.sqhk.co/fojufifef/o5VAPQu/73694320397.pdfIn PDF document text
    • https://cdn.sqhk.co/molavagew/6hj4G16/lagu_on_my_way_koplo_mp4.pdfIn PDF document text
    • https://semufukat.weebly.com/uploads/1/3/1/8/131857602/kikevuxavaj_vopaviwarako.pdfIn PDF document text
    • https://cdn.sqhk.co/zivalutapa/icNgghh/nojunomezufibir.pdfIn PDF document text
    • https://cdn.sqhk.co/wazilisiko/AAggEtt/23129892803.pdfIn PDF document text
    • https://cdn.sqhk.co/zoribakim/ijeL8jg/relais_chateaux_family.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486775/normal_5fc82a9eb9a5e.pdfIn PDF document text
    • http://birebap.scienceontheweb.net/tifukugokikobizoxuzoteka.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://s3.amazonaws.com/pidufozu/26037538735.pdfIn PDF document text
    • http://bototiluwoge.atwebpages.com/charcoal_briquette_making_process.pdfIn PDF document text
    • http://tameladizikep.atwebpages.com/factionalism_in_politics.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/rikozuwajixeg.pdfIn PDF document text
    • http://ladurabazidema.onlinewebshop.net/braun_ear_thermometer_reads_low.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/borajibusaledavad.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_off00010245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10245 5592 bytes
SHA-256: 0da47a2ebb0c61ab03cd77fb1c272f98901233c163d8a43707ff4471ff5bfe1e
font_01_sfnt_off0001153e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153E 10632 bytes
SHA-256: 95796eeaead40a00e982e237e23ffe8a53fda23d97aa396db903662c8b1dc22c
font_02_sfnt_off000139b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B8 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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