Malicious PDF — malware analysis report

Static analysis result for SHA-256 019a82a0b7ab1c30…

MALICIOUS

PDF

80.3 KB Created: 2021-02-24 07:09:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2cf04c81585c5a2cfab516cf0354c10a SHA-1: 55a06a6db98d3c7abe974c012474db11e36804c1 SHA-256: 019a82a0b7ab1c3076364f4b42c0681386d3f1de4d90bfc6d27f94ed556d9ed1
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, suggests a lure related to 'Pompeii's secrets worksheet answers'. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=pompeii%2527s+secrets+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480581/normal_5fe7b12165652.pdfIn PDF document text
    • http://iceteas.space/16918120912py2lt.pdfIn PDF document text
    • http://zebrait.fun/widaminuru88m5b.pdfIn PDF document text
    • https://gifezimudafero.weebly.com/uploads/1/3/4/3/134312010/1411f38.pdfIn PDF document text
    • https://ruxetire.weebly.com/uploads/1/3/1/3/131379726/385bf4f21e.pdfIn PDF document text
    • http://expressvpn.store/kubekebuapkv.pdfIn PDF document text
    • https://talipugetajizan.weebly.com/uploads/1/3/4/8/134862074/zibezexumad_kefesixe.pdfIn PDF document text
    • http://dimax-matrasy.ru/mastercraft_crafting_and_building_download0hd2m.pdfIn PDF document text
    • https://vosanuxavuzom.weebly.com/uploads/1/3/6/0/136089669/fodawapefuja_gaduro_porenasitetopod_texugutuvok.pdfIn PDF document text
    • http://7lessons.space/newenuzobrypsj.pdfIn PDF document text
    • https://xifofenanupov.weebly.com/uploads/1/3/4/8/134857182/jixanatafitekuw-vifomez.pdfIn PDF document text
    • https://kaseloguxov.weebly.com/uploads/1/3/1/4/131406527/dafopuzotukik_jeweribeli_zujujej.pdfIn PDF document text
    • http://discount50.pro/72109218243kr163.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/igfMEhj/skyblock_for_minecraft_education_edition.pdfIn PDF document text
    • http://getsol.xyz/vopopakakugatix9d.pdfIn PDF document text
    • http://obschee.xyz/kugepojijkn8zr.pdfIn PDF document text
    • http://compte-cmbretagne.best/bupujoxenuradawojememixubdbg4.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
    • 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_off0000f15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15E 5120 bytes
SHA-256: cd7e3f125729a6d33c7ec5f6edb5ec1a7f26acca02cad2ba00b1e6b139cb32f1
font_01_sfnt_off000102aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AA 10396 bytes
SHA-256: 8c301fdc042a0c6addd307b9e1792acbe10a6729784ea0e49d02d52c9df87ed4
font_02_sfnt_off00012628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12628 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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