Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ddb27b7c27a297…

MALICIOUS

PDF

77.8 KB Created: 2021-03-30 13:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ff80d185ead21af1e0acf81858d9f2c9 SHA-1: 6cc88b963c0d6965bbc94ead0c1b9c4b2e69ce42 SHA-256: a4ddb27b7c27a297f7257fb25a0ab8ced1a007bc71d3efa56b2cbd329e098166
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which are part of a link farm designed to improve search engine rankings, indicating a phishing or scam attempt. The presence of a 'download button' heuristic further supports this, suggesting a lure to download malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/award?keyword=body+parts+for+kindergarten+pdf PDF link annotation
    • http://fruitik.space/pegevixopaji9j5s6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367920/normal_5fe128ef07b7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393499/normal_603a00c29d698.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470537/normal_5fce0ea5b19e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485695/normal_603a13ca15bac.pdfIn PDF document text
    • http://alkostore.xyz/3743770359nbn49.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/divelikubapiwaj/driver_hp_m402dne.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/arya_samaj_movement.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/amoeba_sisters_meiosis_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/how_heavy_is_a_55_inch_samsung_tv.pdfIn PDF document text
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_86ffd8431ce0440d9552c9ca1483e32d.pdf?index=trueIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_d2d8743d918b4a4a9d48146c807eea7a.pdf?index=trueIn PDF document text
    • https://f3dcd8e3-6656-4b47-a81e-a993d3c4f2a1.filesusr.com/ugd/aa9ef2_75a29dfc87dd4528ad3c71a2d469d216.pdf?index=trueIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_93add9c53b3d480dbb4f3b684550480d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/boom_boom_new_english_song.pdfIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_18cedd71e5a74dceb2e5ec432801ede7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/setikizo/audacity_for_ubuntu_16._04.pdfIn PDF document text
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_d51436c12a8a48acbb62731505ea0a32.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/one_page_bootstrap_template_free.pdfIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_0fd1f238d1ac4350a5158a7ce0cb3b12.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/drug_test_results_template.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_off0000f29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 5392 bytes
SHA-256: 6c097fccb719af4fe51f336bb49fab4bc48cd0883bd2804efba8a34c09e5a1f8
font_01_sfnt_off00010516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 10848 bytes
SHA-256: de2fcb413368bf66af05bcd4aa21389b9bbd0fe7aa9048b9b48bace7837f0d37

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