Malicious PDF — malware analysis report

Static analysis result for SHA-256 3956d552b4d93487…

MALICIOUS

PDF

82.4 KB Created: 2021-01-28 23:48:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6f33007bbc175c1fbeb05b1226f89a47 SHA-1: a39b87673947e90cb91ca02cef0040d563201049 SHA-256: 3956d552b4d93487eff7bad62c3debb5c104f965fa60e26fcc5bfa28a4f2170a
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'business calendar 2020 app', suggesting a lure. The presence of many external PDF links, some pointing to S3 buckets, indicates a link farm or content distribution network, likely to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ggtraff.ru/wb?keyword=business%20calendar%202020%20app In PDF document text
    • https://cdn-cms.f-static.net/uploads/4458137/normal_600a71f957393.pdfIn PDF document text
    • http://fixmarker.fun/nokitufopelutf0tdv.pdfIn PDF document text
    • https://dezazobe.weebly.com/uploads/1/3/4/7/134755526/wurerivorozamijatir.pdfIn PDF document text
    • https://wakepazatojux.weebly.com/uploads/1/3/0/8/130873951/wozezobonupaxo.pdfIn PDF document text
    • https://vulemozebo.weebly.com/uploads/1/3/4/6/134693025/foponixe-nuzexur-fezapuz.pdfIn PDF document text
    • http://alfa-quest.ru/princess_salon_2_hack_apkbevvy.pdfIn PDF document text
    • http://magnetfix.store/767459610439up9l.pdfIn PDF document text
    • https://doritader.weebly.com/uploads/1/3/4/8/134885844/1647230.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471706/normal_600d4c43cdb1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487927/normal_5fd33d4b220f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387219/normal_5fd85cacb2de7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478669/normal_60066fa4c8ff7.pdfIn PDF document text
    • http://frukt.fun/physical_organic_chemistry_solutions_manual20wa7.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/wejuvono/74124011380.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/same_love_violin_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/contemplate_crossword_clue_8_letters.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/nugesudisaburuwakoga.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/76358983006.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/kuguvo.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/17922772763.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/23729155919.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/teamviewer_9._0.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/reference_letter_for_employee_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_off000104f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F1 5388 bytes
SHA-256: c3ef3ee48756fde577f7601c26d3fa2211ab0936918ac789e16c2b18019d26b6
font_01_sfnt_off00011753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11753 10880 bytes
SHA-256: 7e99811ec9cdbcaaf4a1a7e85084f97f4c305b3ec6b99fa90d19d75953bd0bc6

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