Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e887b2e66521d1…

MALICIOUS

PDF

80.3 KB Created: 2021-04-28 18:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6101a3f1662d80dd32df5fb2de1c8370 SHA-1: 6900d5e06c5d96c4581ceff7473809a02766aa09 SHA-256: d7e887b2e66521d11b7caa25e86c1a4a3974e7585b7fede983a16964815b8bae
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and includes a URL with a 'utm_term' parameter suggesting tracking or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://jacksth.ru/strik?utm_term=nordyne+diagnostic+codes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392207/normal_6038d108a358a.pdfIn PDF document text
    • https://mofasabopileb.weebly.com/uploads/1/3/4/1/134109330/gamisase.pdfIn PDF document text
    • https://lokugejepotag.weebly.com/uploads/1/3/4/3/134318746/eef59c078a.pdfIn PDF document text
    • https://wozogerodinanu.weebly.com/uploads/1/3/4/4/134498855/2643807.pdfIn PDF document text
    • https://tekopazaxalar.weebly.com/uploads/1/3/4/3/134348639/4445363.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467043/normal_5ffaa04e5bf71.pdfIn PDF document text
    • https://jenogisemelo.weebly.com/uploads/1/3/2/3/132303080/lulawulogozejuregide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_dbfd8b7aa21946eb9dbd70888cccd2f8.pdf?index=trueIn PDF document text
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_da9787d1e3c446aa86d17fb17fe4154d.pdf?index=trueIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_ca90a260c06d49748d1e50c5a8c99992.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e73bddd8-683c-4ed7-8486-ad67509fe370/30401378511.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/blanco_sink_installation_guide.pdfIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_4b11804ae6384762bfdbe98094763161.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/697a19d9-a412-44a1-8bb2-b4af2cea018a/the_tragedy_of_macbeth_act_3.5_and_3.6.pdfIn PDF document text
    • https://b0cee159-9ce3-47d2-9452-de9e383f1b6b.filesusr.com/ugd/fac5c7_c9acb95de0d1406fa2ca9be728d31d03.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/63753103455.pdfIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_22f7ac92dcc9408d9be5339b56b8e376.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/vijodajoniwovim.pdfIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_c009fceea8ca4a08936e988fb7f41920.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa064426-f92f-4da7-9fe2-0a2436243459/dajuz.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/xelaleserel.pdfIn PDF document text
    • https://63dbeab4-18c6-4677-a808-17cd77aec119.filesusr.com/ugd/963d80_2e8a18fe25b34d3f907ff24c669055ac.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_off0000fd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD68 5144 bytes
SHA-256: 74485ff678d45cb3df940ac60f2db682af5f2442da2f6d3f25545cf950968327
font_01_sfnt_off00010f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F04 10792 bytes
SHA-256: 6250affb343faae12f573897446af21ab74806d67d29f951b931098708224e43