Malicious PDF — malware analysis report

Static analysis result for SHA-256 7433cc21238b05d8…

MALICIOUS

PDF

75.6 KB Created: 2021-02-20 11:07:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 02a27d64b90d7c9513a85e7f5456b8de SHA-1: e904b209f9d80cc2066779139836d487c498751f SHA-256: 7433cc21238b05d805e085e71686518246286dcbd6421734676c70d099e92b5f
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting or redirectors, indicating a link farm designed to distribute malicious content or phish for information. The document body, though heavily obfuscated, contains text related to charging an electronic device, likely a lure to entice users to click on the malicious links. The presence of a known malicious redirector URL and ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+to+charge+ultimate+ears+boom+3 In PDF document text
    • https://cdn.sqhk.co/sasimidiweg/qryEgeb/lorojelukefawudavinovu.pdfIn PDF document text
    • https://cdn.sqhk.co/kezinujus/ijgwibE/bibemulilafesotuna.pdfIn PDF document text
    • http://fulusixavopowem.iblogger.org/55728138863.pdfIn PDF document text
    • https://fomilapemarujan.weebly.com/uploads/1/3/0/8/130814088/5391019.pdfIn PDF document text
    • https://cdn.sqhk.co/fipufose/BYVYgca/tejujutatogumoboluxo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468531/normal_60045029db04c.pdfIn PDF document text
    • https://cdn.sqhk.co/kamozipu/hhfaaug/zufewuserime.pdfIn PDF document text
    • https://cdn.sqhk.co/dadirowuj/Shgg6NI/clean_road_bike_crankset.pdfIn PDF document text
    • http://niwawopomovaz.22web.org/film_atlantis_milo_s_return.pdfIn PDF document text
    • https://vomimefime.weebly.com/uploads/1/3/5/3/135316042/7b484bf8a0.pdfIn PDF document text
    • https://bimuwalunamen.weebly.com/uploads/1/3/1/3/131384226/9767324.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://fawepajemug.rf.gd/square_root_simplified_radical_form_calculator.pdfIn PDF document text
    • http://dinisevorodak.epizy.com/puvosifog.pdfIn PDF document text
    • http://vepisesilutez.epizy.com/55170359776.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8B 5344 bytes
SHA-256: ee5f044c8a9d6056421a35404bf4a4bee3122529394d661720076ac11d37eed4
font_01_sfnt_off0000eecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 10816 bytes
SHA-256: 1928b06b9aae239a75175e234c447e1fc4ab0315ee471617d11b3c7a0d726ed3
font_02_sfnt_off0001139b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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