Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9410de90bbf45e7…

MALICIOUS

PDF

61.5 KB Created: 2020-11-26 03:27:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c38de818e6097bd26d0b5c960b7bb40e SHA-1: 10340d77c78ded551b463515f9de3ede132f6683 SHA-256: f9410de90bbf45e72b13dd1b2f26864a07225446e0d6a127de61bb17c5e90866
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous external links, likely to host malicious content or phishing pages, disguised as SEO-optimized PDFs. The presence of a download button lure further supports a phishing or malware distribution scheme. No scripts were extracted, but the overall structure points to a phishing or malware delivery attempt.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/123?utm_term=a+pronouncing+dictionary+of+american+english+pdf+download PDF link annotation
    • https://neboxikadifi.weebly.com/uploads/1/3/4/5/134588308/wapekov.pdfIn PDF document text
    • https://xavixikani.weebly.com/uploads/1/3/4/5/134502132/58c8f78.pdfIn PDF document text
    • https://rabexowubomisuw.weebly.com/uploads/1/3/1/4/131407155/59c9aabc.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/9402018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422390/normal_5fb753299829c.pdfIn PDF document text
    • https://zuvagenujak.weebly.com/uploads/1/3/4/4/134454716/vobodetipugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5f8717131a155.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/pewebopufupe/brother_sewing_machine_lx_3125_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b896822-b60b-4e70-a799-245cea3520f8/fundamentals_of_electric_circuits_5th_edition_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/zee_bangla_saregamapa_2018_nobel_song.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/morosukuxoda.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/formulierung_englisch_bewerbung.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/wojabewamagogigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5672635-32f1-475b-afcf-0f3f40dfb165/haz_llover_letra_jesus_culture.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_off0000b395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB395 5752 bytes
SHA-256: b3113677f4e970240da0454f51568ba90835af50db1b5d37d96b47d68c136cc6
font_01_sfnt_off0000c71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71D 9856 bytes
SHA-256: 71b36acfc5f443a4a8d43830b5513c29fcb67f899564e6c54e1c79961aa98ca4

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