Malicious PDF — malware analysis report

Static analysis result for SHA-256 173a2626692665c1…

MALICIOUS

PDF

84.7 KB Created: 2021-02-10 22:05:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ff218d78e8b17f99295cad0d5c5bc5d8 SHA-1: ea562579e7569cf9f049575bb8e52ad9067e4955 SHA-256: 173a2626692665c11fddb1236c3737c78de7d0451ba796f4cf606ff71f3d7a5f
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier. It contains a large number of external links, many pointing to potentially malicious domains, suggesting a link farm or phishing campaign. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jacksth.ru/aws?utm_term=doppler+waveforms+radiology PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443595/normal_6012e6c708576.pdfIn PDF document text
    • https://puvomowaja.weebly.com/uploads/1/3/4/3/134318832/5883881.pdfIn PDF document text
    • https://cdn.sqhk.co/xenumobavun/hejdjd6/jagomud.pdfIn PDF document text
    • http://jumpfs.space/9717896386057sas.pdfIn PDF document text
    • https://kamukijupekud.weebly.com/uploads/1/3/3/9/133997827/c1e41c38380.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/dhghjgc/grand_prix_story_kairo_car.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/unofficial_lego_technic_builders_guide_2nd_edition_downloadm6wtq.pdfIn PDF document text
    • http://remont-kvartir-otzyvy.moscow/32404520960kgjyl.pdfIn PDF document text
    • https://kozitasulama.weebly.com/uploads/1/3/4/6/134647404/fesaviraw.pdfIn PDF document text
    • https://cdn.sqhk.co/leluforeref/giifjjT/photo_collage_maker_free_download.pdfIn PDF document text
    • https://ribupawotomimam.weebly.com/uploads/1/3/4/6/134694318/7571148.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/ratixifo/indian_navy_information_in_marathi_wikipedia.pdfIn PDF document text
    • http://bilunijo.epizy.com/54176034765.pdfIn PDF document text
    • http://tifoxirekurox.epizy.com/pokemon_art_style_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/3363151861.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/fejivemitezelenot.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/proxy_server_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/dosejigebapudesavuvagiv.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56A 5616 bytes
SHA-256: 106cf12fa8211f150652cf498f10ca4fb2ea8119f5691581266e14fa68b2609c
font_01_sfnt_off00010893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10893 11528 bytes
SHA-256: 125b8fa917e733a273ec5a2b5c909da3f253debd726ed79b3112c9fb580a1d31
font_02_sfnt_off0001305e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305E 16092 bytes
SHA-256: b8e826394925014a02bf84045eeeeccc9ed4b8ea5073033556d70df744ef61b6

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