Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca572da42494b21…

MALICIOUS

PDF

67.7 KB Created: 2021-03-05 02:09:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 97395cebb31ecd838649411ebdc04448 SHA-1: b05a487fa3f0feb3ee69a97d52c00fea1fdb7106 SHA-256: aca572da42494b21b79548d8cd09a03fc764bf423a1a8cbe68f0b6b495503506
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to redirect users to attacker-controlled sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/award?keyword=libro+dejame+que+te+cuente+jorge+bucay+pdf PDF link annotation
    • https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/ketidasix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448540/normal_602a2c32b294b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_601fb966f3d9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475859/normal_5fcc6dd42fb8f.pdfIn PDF document text
    • https://fufukarebalomok.weebly.com/uploads/1/3/4/3/134352968/nepes_sovuv_gazubimek_fipovexof.pdfIn PDF document text
    • https://solusolifodijal.weebly.com/uploads/1/3/4/4/134433047/4562732.pdfIn PDF document text
    • https://xedutorapul.weebly.com/uploads/1/3/0/8/130813372/joxivaxuxixer-gexegutiti-podirejagiwab.pdfIn PDF document text
    • https://buzufurabobozu.weebly.com/uploads/1/3/5/3/135304208/dozerekaxilosodegas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382413/normal_5ff6871ed70b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388839/normal_60000acab70a9.pdfIn PDF document text
    • https://fusajebotiv.weebly.com/uploads/1/3/4/3/134320253/ranif_vumejugijira_napogasewuzasos_vofodekitop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497646/normal_5fd60dab92550.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379229/normal_5fc7be60a9108.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_b17f4bcd1bd94553a95b5e9efdc9f843.pdf?index=trueIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_0138e557a3b94c26ae86809c531a77b5.pdf?index=trueIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_a1a0583b350b48349a97e401333aa4dd.pdf?index=trueIn PDF document text
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_eda8c8c9b9c54252b7937eb629d97aec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1bc8532-87e7-4c95-a8b9-a3839c053ac6/fizes.pdfIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_31793bc377dd47358cb499f7a49e4847.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f6f4d7c-483d-451e-80b3-f1a0c585e97d/xagexuzetafigezavidak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74e38171-0140-4132-b9ba-1275ba2661c4/4992198193.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd917c60-a42b-4105-92ce-c8ee7fb374dd/sufajusowopuxesamitevubil.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC984 5652 bytes
SHA-256: 260be6c5d7dc1935667ac747e03f824b7bd673080f5d9835192bd70e46abdb65
font_01_sfnt_off0000dcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAE 10652 bytes
SHA-256: 442c9cf43f15c7789deb01db29c5738a8979f470a0e8ff706999b43736fc6305