Malicious PDF — malware analysis report

Static analysis result for SHA-256 696fe0c1933090f8…

MALICIOUS

PDF

77.7 KB Created: 2021-03-11 17:51:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c35e799239dd10a7b990ffda9cb15c95 SHA-1: 40f89f27faa81a49e1c7c41c331d234892663447 SHA-256: 696fe0c1933090f8897aab1241b22e83f12876334261bf24c29a133488e313af
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains keywords related to a worksheet, likely a lure to encourage users to click on the embedded URLs.

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://golowaki.ru/wix?keyword=meiosis+review+worksheet+rcsd+answers PDF link annotation
    • https://cdn.sqhk.co/xijisejes/xjiUORW/vekukure.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/tNNhhtZ/zemefimemibigiteboxer.pdfIn PDF document text
    • https://lagomumudalo.weebly.com/uploads/1/3/2/6/132681699/9c39ecc12.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/elements_of_writing_ppt.pdfIn PDF document text
    • https://cdn.sqhk.co/suwuwewazaka/ejcAsZ8/fimag.pdfIn PDF document text
    • https://cdn.sqhk.co/xapawavuma/agjDLer/google_sheets_dedupe.pdfIn PDF document text
    • https://peziwotikiju.weebly.com/uploads/1/3/4/6/134602895/xebibesaf-zokoputevat-wiruliwumav-mumafufinamiv.pdfIn PDF document text
    • http://bijopesenof.iblogger.org/formas_de_usar_una_chalina_con_vestido.pdfIn PDF document text
    • http://giocodigital.fun/outdoor_gate_keypad_locky7e0r.pdfIn PDF document text
    • https://cdn.sqhk.co/jatobeguji/XiOghii/56498094476.pdfIn PDF document text
    • http://talemine.getenjoyment.net/canon_xh_a1_service_manual.pdfIn PDF document text
    • https://vakexojukesazi.weebly.com/uploads/1/3/0/9/130969985/a938fb661c2.pdfIn PDF document text
    • https://cdn.sqhk.co/lixozimiz/Rgchghi/xumuder.pdfIn PDF document text
    • http://instapriz24.online/fenirifot9mak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedetikapore.epizy.com/hematology_clinical_practice_guidelines.pdfIn PDF document text
    • http://nimunofat.epizy.com/dec_calendar_2018_template.pdfIn PDF document text
    • http://walexesanub.rf.gd/flat_insulating_concrete_form_foundation_walls.pdfIn PDF document text
    • http://bukuzem.rf.gd/receipt_bill_template.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_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 5216 bytes
SHA-256: ea8ffc3a9d9b902077cd9d96f314f206c0c34765ff0efb7a27fc359e9071dc1b
font_01_sfnt_off0001043f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043F 10848 bytes
SHA-256: 71ebaafcd3b95e45d7a51fac6802698584705df510dbe600eb24bbde5a5440fb

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