Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e13608967ceb348…

MALICIOUS

PDF

80.0 KB Created: 2021-04-04 00:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b3516a08da0047b2f024760233b1e19c SHA-1: 513797f9fe4536d874d1de66a0782ef6ebec0b95 SHA-256: 1e13608967ceb34890782fe81924b038d68c84ae307e917e278f23f879706d6b
186 Risk Score

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 0.9993

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/wix?keyword=probability+simulations+worksheet PDF link annotation
    • https://xogefuvoza.weebly.com/uploads/1/3/2/3/132303221/6178321.pdfIn PDF document text
    • http://susurrus.space/22883210390xwwir.pdfIn PDF document text
    • http://koolmaxt.online/lubekojirxj650.pdfIn PDF document text
    • http://opensalle.xyz/houston_texas_sales_tax_rate_20182m9of.pdfIn PDF document text
    • https://pupazugosabi.weebly.com/uploads/1/3/4/8/134868946/a963328d96f09.pdfIn PDF document text
    • http://koprovk.xyz/112243030545bpps.pdfIn PDF document text
    • http://helpcopyright-service.com/guilty_pleasure_lyrics_elton_john10vl4.pdfIn PDF document text
    • http://lightstart.xyz/904731817470mx1.pdfIn PDF document text
    • http://vawadofofasip.getenjoyment.net/rd_burman_songs_list.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://ganoworot.weebly.com/uploads/1/3/4/2/134236177/9130112.pdfIn PDF document text
    • https://vafunaparixidi.weebly.com/uploads/1/3/4/6/134627598/jorefonix.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/tough_solar_g_shock_reviewdurs6.pdfIn PDF document text
    • http://buyervannakupitvsem.xyz/69088037926bpln.pdfIn PDF document text
    • https://ramexolilaburav.weebly.com/uploads/1/3/4/3/134331107/golig-giteverigoxe-namudop-runojoligexepom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6997f972-013f-4c6f-ac95-4179ba17a557.filesusr.com/ugd/549e1a_5d48c44be4d64078afc164c799babea1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac7cc090-b3ec-4190-87e2-da5884953e84/dunkin_donuts_hot_mocha_latte_calories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/134dda97-46e5-4d2b-abfc-fbb92ae528bc/birini.pdfIn PDF document text
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_4c360c89d1024a35bb722f82329c376d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef217bcf-342e-452c-9094-5e9b1545668b/4416071275.pdfIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_4f2134aaa73947b297dd959bcf50f6a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/178e0fd6-c1f6-435a-ab2b-43f116a5e0b0/advanced_python_3_code_examples.pdfIn PDF document text
    • http://rususekobijo.myartsonline.com/porque_estudiar_administracion_de_empresas_yahoo.pdfIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_31a0a4780224446a918dda66382e13cd.pdf?index=trueIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_3d3c560bc8b14e20a81d4bc7e93dcdad.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_off0000f97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97A 5324 bytes
SHA-256: 667edefe8e41603421ae99bb3babf51a1d43886b022974836ed7fae238bd67bd
font_01_sfnt_off00010b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7B 10904 bytes
SHA-256: cbd79a568eb90eaa76d2cf5190cea65b759e4e2d89ace17a629726d568d77b62