Malicious PDF — malware analysis report

Static analysis result for SHA-256 585f3bf7ed2d3b16…

MALICIOUS

PDF

124.8 KB Created: 2021-03-20 02:48:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 526ee44552f1c3ce6092b54fb116939b SHA-1: bb1783e0253b396ba36eee13341936ec344dbcdc SHA-256: 585f3bf7ed2d3b165a0e5877177aa627ee60a3fbecbe0c16730ffa7eb4ea2429
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external URLs indicate a likely attempt to deliver a second-stage payload or phish for credentials.

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/award?keyword=innovators+walter+isaacson+pdf+download PDF link annotation
    • https://cdn.sqhk.co/wepunajexiju/u8Pgiha/litirivufan.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/idNgc9F/34586643828.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimole/pQhhji5/stick_figure_castle_defense.pdfIn PDF document text
    • https://dukopovofozevi.weebly.com/uploads/1/3/5/2/135295758/jasusedeger-vofosagamujo.pdfIn PDF document text
    • https://gokisixoxi.weebly.com/uploads/1/3/4/1/134108612/afb763f6ea0061e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384634/normal_5fcd726c1c0b2.pdfIn PDF document text
    • https://nikizatul.weebly.com/uploads/1/3/5/3/135309179/9462724.pdfIn PDF document text
    • https://cdn.sqhk.co/budatumibowu/ujipWhb/billian_billian_new_hd_video_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428054/normal_6053bb41ca39b.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/ZSigbgf/xabevaxotajefolidifufo.pdfIn PDF document text
    • https://cdn.sqhk.co/fabetojowuje/WSteheu/59101730883.pdfIn PDF document text
    • https://cdn.sqhk.co/jitegoji/hdodjdH/60402485868.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/wulagisi/fotulim.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/icai_bos_ipcc_suggested_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/15721840669.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/barbie_makeup_games_free_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/92402343552.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_off0001956a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1956A 5240 bytes
SHA-256: fc1313330ec3dbd1d91f13df8b8c8ca5dc7334a5410e6c3dda9ec6dfea13ceba
font_01_sfnt_off0001a763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A763 11636 bytes
SHA-256: 64d03ebc946585a64362472067744f67a8a03f9b1b4fcbc84f5eda6edc8a0cf6
font_02_sfnt_off0001cf25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF25 16452 bytes
SHA-256: e996d7728a4c3280414fb0b087adbec8e883e1f2e454e604528eb600bf1cf7d8

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