Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a44062a2f28a6c8…

MALICIOUS

PDF

72.7 KB Created: 2021-02-12 01:51:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b1b22cd4118d25dc7f0fffab0bf2ad69 SHA-1: c8085102c0240046b551713933238f90eb4fa6cb SHA-256: 0a44062a2f28a6c8631814bdc2fb6ac08efb770c5e0e8895819feda206a67f08
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to educational content, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/wix?keyword=find+the+missing+addend+worksheet+2nd+grade In PDF document text
    • https://cdn-cms.f-static.net/uploads/4476766/normal_6021a6f694e27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366382/normal_5fd0ea754ca7b.pdfIn PDF document text
    • http://deruvakibifazo.iblogger.org/reded.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485310/normal_600290ef9acde.pdfIn PDF document text
    • https://finudekenituw.weebly.com/uploads/1/3/6/0/136053274/4456829.pdfIn PDF document text
    • https://gojafone.weebly.com/uploads/1/3/4/8/134891791/dosinu_jevobosari_zopesituzirip_kiferolado.pdfIn PDF document text
    • http://skywonder.space/3511034980786xgl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477162/normal_601551a29eb7a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/galvanized_roofing_sheets_sizes.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/tewilesexokusoj.pdfIn PDF document text
    • http://jevigoxiferoka.epizy.com/blank_notes_page.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/pathogenesis_of_cholera.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/excel_sipoc_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/33881903391.pdfIn PDF document text
    • http://fawujuvuz.epizy.com/buvixulu.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/15033632054.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/answered_prayers_mtg_explained.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/tesaxujizitobusubuk.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/leditazim.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_off0000dd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD04 5452 bytes
SHA-256: 7ff25cdf53f727759715883076243ac36c3adb96a4eccb2621dbd7e99809bde7
font_01_sfnt_off0000ef74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF74 10616 bytes
SHA-256: b7fc02756656a9ad190e1d21b3fd5c36a9aa637299d587386e1dc923e1f88254

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