Malicious PDF — malware analysis report

Static analysis result for SHA-256 3629afb96328fb44…

MALICIOUS

PDF

73.5 KB Created: 2021-03-16 05:50:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a499422b5a52a2c4e4a3f25bd959253 SHA-1: 76c8ccd9ae8a10606b45fe44b19146e9a6120a60 SHA-256: 3629afb96328fb449b4d5f39087fbdd89d7c8e8d137ce9775ef017969e88f358
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 "PDF_SEO_LINK_FARM" heuristic, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs likely lead to further malicious content or phishing pages, and the document body, though heavily obfuscated, contains metadata related to the creation of the PDF, possibly as part of a content generation process for SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/123?utm_term=barbie+fairytopia+mermaidia+movie
    • https://cdn.sqhk.co/tumexifukevu/ghi2pHR/word_of_the_day_oxford_with_meaning.pdf
    • https://malosana.weebly.com/uploads/1/3/5/3/135323031/7159431.pdf
    • https://cdn.sqhk.co/bitaxukezor/5XOoYrE/head_ball_soccer_euro_2016.pdf
    • https://cdn.sqhk.co/zoxemetakol/5K0hbij/62270294111.pdf
    • https://cdn.sqhk.co/laloropaki/jbhdifZ/33149460899.pdf
    • https://cdn.sqhk.co/tobizopowebo/XLbMiaK/dotomuwij.pdf
    • https://zegikawa.weebly.com/uploads/1/3/4/6/134640481/funomesivotud.pdf
    • https://cdn.sqhk.co/jeposanop/hvQOxzt/68453014677.pdf
    • https://cdn.sqhk.co/xudadidi/Lfigeid/sirasiforalezugikuxafusor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d206a8b1-b6ea-47c1-b30e-32163ee8096c/kamutogebegaxito.pdf
    • https://uploads.strikinglycdn.com/files/8b2dd92a-68b3-4a9b-93fd-73789a8d648b/32063076172.pdf
    • https://uploads.strikinglycdn.com/files/73ab08db-cb26-400f-937b-3edf3eebfa4b/70753880609.pdf
    • https://s3.amazonaws.com/nitidadufetenu/online_quran_reading_16_lines.pdf
    • https://uploads.strikinglycdn.com/files/84dd7439-3162-4605-bf91-3ef320e84c11/67826930596.pdf
    • https://uploads.strikinglycdn.com/files/bba8e47f-623e-4fd2-a8c0-4fdac5977bc0/46932333530.pdf
    • https://uploads.strikinglycdn.com/files/6a3941f4-ab84-44f4-9ed5-b4ab2d005f7b/vobeloramunoxogupisuzawa.pdf
    • https://uploads.strikinglycdn.com/files/ccf6b48d-4c43-4ccd-b55d-7f3b75cab4ce/88149139996.pdf
    • https://uploads.strikinglycdn.com/files/475b747b-8dba-458d-a2a8-c613bed12a18/wokivozejijekurobaparifog.pdf
    • https://s3.amazonaws.com/mokixetat/iso_27000_vs_27001_vs_27002.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e156.bin
4a9482e48344f3151704c2c13438f9d16548414c5a893e8489e04037f8d2b48b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE156 5328 bytes
font_01_sfnt_off0000f36e.bin
2d076f5a00813b03385574acec485844873e8c175ee81d04f9503b7814c29102		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF36E 10992 bytes

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