Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e68241150a7d7bf…

MALICIOUS

PDF

82.4 KB Created: 2021-03-17 08:25:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 9c0f2a54a6edb41d5181a633c1a54ab3 SHA-1: d4f536799e31a8f3dc0a7fc9f351381ccdac6a21 SHA-256: 5e68241150a7d7bf30165f84207a476d6ef220519cf8907d4d835ee9f396c5e0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One prominent URL, 'https://jottigo.ru/award?keyword=group+isomorphism+theorems+pdf', suggests a lure related to academic content. ClamAV also detected this as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the overall structure indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jottigo.ru/award?keyword=group+isomorphism+theorems+pdf PDF link annotation
    • https://cdn.sqhk.co/dogutadova/t7iijaR/25667919948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402724/normal_6012321b6a3de.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/Xifpchz/target_archery_scope_lens.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489607/normal_6011c75929b34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467019/normal_600fa433db831.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493891/normal_602c65f48f18f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392191/normal_5feeedbb9d230.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389823/normal_5fe924056282a.pdfIn PDF document text
    • https://cdn.sqhk.co/gojinuma/ibRxSid/national_geographic_magazine_subscription_gift.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381730/normal_601eba0ba0664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421787/normal_5fdb1eff0ea27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391898/normal_600d2ef3424a2.pdfIn PDF document text
    • https://cdn.sqhk.co/pasededi/chfhgLT/mr_rock_and_roll_guitar_chords.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413239/normal_600574ab7c8f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377931/normal_5ff47048cd095.pdfIn PDF document text
    • https://cdn.sqhk.co/jizuxadif/4jbYieI/pictoword_level_55.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/toguvaju/58686453617.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/28030695859.pdfIn PDF document text
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_8e9f4a7ba8bf4d04a112dbe63c0ad4aa.pdf?index=trueIn PDF document text
    • https://a35b4eae-300a-44a5-b982-8d633984e519.filesusr.com/ugd/19735e_edcad4ef431a4aacab379f25b68313b3.pdf?index=trueIn PDF document text
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_71217bde3ea9444fa7197ed594975578.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejobu/vintage_casio_calculator_manual.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_off0000eb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB96 5068 bytes
SHA-256: a0289dddab5d53979625241a09bf289d3f01ce460f6f4035a4b2d3d3fd25ca38
font_01_sfnt_off0000fcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAB 10980 bytes
SHA-256: 19593f5dabce8a0f21520666d310a278ae87056d8d8df6616f0d6b64d547ddc3
font_02_sfnt_off000122b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B9 16752 bytes
SHA-256: 80a8e903e58b347f484610b884e3be6c18ca99a343ec399a6f3b1724fadddf77

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