Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d12a72a3cf5dfc4…

MALICIOUS

PDF

95.2 KB Created: 2021-05-19 23:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 042e6100635c1bfc944adff6c94149cd SHA-1: bf3a0bd800af5a0757af8d71bee43fe4fa62d68d SHA-256: 2d12a72a3cf5dfc4b42bcc465e04baa6b657deb9e2d0ca4d0198284c69015bb4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to disposable hosting services like Weebly, indicating a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of numerous links to potentially malicious sites is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://gegoviboz.weebly.com/uploads/1/3/4/8/134876631/5698620.pdf In PDF document text
    • https://paweweribawu.weebly.com/uploads/1/3/4/6/134656346/5de45bc80e.pdfIn PDF document text
    • https://gedijidejejew.weebly.com/uploads/1/3/0/7/130775336/6843636.pdfIn PDF document text
    • https://ruxelasukosife.weebly.com/uploads/1/3/4/6/134667582/lavagemefa.pdfIn PDF document text
    • https://dosodufixelo.weebly.com/uploads/1/3/2/6/132682620/wogonizonenun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402956/normal_6060464199f48.pdfIn PDF document text
    • https://nivasotum.weebly.com/uploads/1/3/5/9/135991747/mugipal_gewiv_siwej.pdfIn PDF document text
    • https://vekerarefatada.weebly.com/uploads/1/3/4/8/134868636/8297316.pdfIn PDF document text
    • https://wojaginobaxap.weebly.com/uploads/1/3/1/8/131857211/4827214.pdfIn PDF document text
    • https://jefiwoso.weebly.com/uploads/1/3/5/9/135996081/4e8e23250b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424349/normal_605b579e3551d.pdfIn PDF document text
    • https://ganokupojedozo.weebly.com/uploads/1/3/4/8/134890080/bff58f28311f57.pdfIn PDF document text
    • https://wipowoniwosixad.weebly.com/uploads/1/3/0/7/130740259/29047c7d3.pdfIn PDF document text
    • https://tuxipowu.weebly.com/uploads/1/3/4/6/134699968/lapetitekukufima.pdfIn PDF document text
    • https://zabaparadasikid.weebly.com/uploads/1/3/4/3/134317604/b2ecdfbd01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402948/normal_5ff24e97d71a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_5fd61d255e71d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474739/normal_601f67c316a2e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/G1IkLG9TFNM/wb?keyword=formation%20china%20himalayanPDF link annotation
    • https://uploads.strikinglycdn.com/files/c0f8f36a-083d-447b-999b-a12b6e1da820/fantastic_beasts_and_where_to_find_them_cast_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2680c6f-b9b1-4eda-ada8-4e50a77e4b11/rudoxatubel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9facfe00-dbbd-410e-b145-d46ad225d789/62675300023.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a1b2c6b-9436-4b28-bdc4-d683505c97da/tuwomobupanodijol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e794833b-5c38-4bb6-83b1-50a29a706218/jaturoxaguzixugosedebub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f44c1984-4b55-4197-b363-7ff35ff2d446/kozanuwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4d5b351-096e-4e1f-bb54-40c89e175a08/rodisipozapomuj.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12394 4916 bytes
SHA-256: ace2d6b707eba66fb832bb79a37cf0eb79e3b46266aa299f8a4545fed8f07405
font_01_sfnt_off00013425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13425 11268 bytes
SHA-256: f1cacccfc48ebc0009235260431b28e40030202907986bcc789cd01f20453c07
font_02_sfnt_off00015a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A41 16060 bytes
SHA-256: a428e84a47d03438fd5ed8c13af51c073340c28df02463183879d2df9ebd4b49

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