Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7eb5d6ea773e2e…

MALICIOUS

PDF

92.6 KB Created: 2021-02-09 11:17:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 9d7ac0e03cdf95ee8213a80f102212f7 SHA-1: 3474ec5ad203e5620c6fa0e0e5b6274efa2a55da SHA-256: 4c7eb5d6ea773e2e2d20c86dbcb9646c63c3fb12662d2871dbffa3672ee22117
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it was generated by a tool rather than being a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/aws?utm_term=stylish+english+alphabets+a+to+z+pdf In PDF document text
    • https://cdn.sqhk.co/litigoruf/chimTdi/blogger_blog_stats.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446161/normal_5fe00bc30d1a0.pdfIn PDF document text
    • http://organicnu.info/kaseniwavilitamv0pcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455657/normal_6013267866f42.pdfIn PDF document text
    • http://baugroup.info/piano_school_smart_piano_learn_appcbclm.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/2rcgXxj/sunegovefalupusi.pdfIn PDF document text
    • https://cdn.sqhk.co/rizonozugaj/aCIvXgc/zara_larsson_wow_remix_lyrics.pdfIn PDF document text
    • http://genoray.pro/filiragepolimesuvupeoav56.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/jgWZeje/tidotuvobotixezokidimilam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guzimuj.rf.gd/rascals_movie_mp4_free.pdfIn PDF document text
    • http://konewumabujak.rf.gd/wolivogutujorefewuvozima.pdfIn PDF document text
    • http://kugaxupupoguj.rf.gd/gakepiwe.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/63218613696.pdfIn PDF document text
    • http://tegemikewik.rf.gd/amistar_top_fungicide.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/acceptable_forms_of_identification_for_notary.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE48 2960 bytes
SHA-256: be7263284c1bec38b81ac97814a660ccaf0ab88dea3640062eecf92d648ef0cf
font_01_sfnt_off0000e8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D5 5600 bytes
SHA-256: 8c92bc601ed3bb32575ff6c6373542f493d512348d15b50e87a6f299a3654aaa
font_02_sfnt_off0000fbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE0 3012 bytes
SHA-256: 76d522251b70187c74ae0932910d5b5e1041b78a3994d4073ccf1ac5543a5e8c
font_03_sfnt_off00010823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 14184 bytes
SHA-256: 1ae5f19b596e51326fe268e5b59e8f34ddc0b10fd2bb017035bf93486eb4e887
font_04_sfnt_off00013682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13682 17788 bytes
SHA-256: 37e83e41281294a64a1b328e837e7b587e147cd09c6726c1d0a7a7bd158eeab4
font_05_sfnt_off00015100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15100 7084 bytes
SHA-256: 3ff56d55e340e11d0433b484581ee8196b2787011fc5bda1825011ff6afa7bb2