Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c9435be8ad21ee…

MALICIOUS

PDF

91.4 KB Created: 2021-03-11 02:43:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7e81fcb97d9bac41f373eff7cce05439 SHA-1: a9b4ded19d809824a75446b9a8d327254a75bb55 SHA-256: f0c9435be8ad21eefde017c508925124d571ed1f91ff5249ed44b039998bcd3a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=blastocyst+formation+ivf PDF link annotation
    • http://luvuzerosotavu.iblogger.org/budazafafesot.pdfIn PDF document text
    • https://redelonoxoti.weebly.com/uploads/1/3/1/6/131606094/jetadezazopat.pdfIn PDF document text
    • https://raxumizagava.weebly.com/uploads/1/3/4/7/134710615/vepotunuruvuped_nabajarupewopu_fixipusozup_xuladesajipe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410730/normal_6021bfa8c59e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460471/normal_60488efd9e00e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488100/normal_5fe4159c5418b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_5fe9b005bd0ee.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/bezegoluzose/dbx_aston_martin_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/67214880947.pdfIn PDF document text
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_1a0bee2440704100ae084009a3db1703.pdf?index=trueIn PDF document text
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_bbd5c4e573fa4f20a02289052895545c.pdf?index=trueIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_06efdec635644209bfe34e2ceb9c216f.pdf?index=trueIn PDF document text
    • http://sugunava.epizy.com/53545422047.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/gcse_physics_aqa_equations_sheet.pdfIn PDF document text
    • http://voderekop.rf.gd/appvn_apk_file.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/terraform_aws_iam_role_count.pdfIn PDF document text
    • http://fepoxojosatomu.epizy.com/guvojotokujedafa.pdfIn PDF document text
    • http://mujawonevafo.rf.gd/form_utility_meaning_in_marketing.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_off00011271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11271 5236 bytes
SHA-256: 79d41136d05b1d23240572e34c1ca6a014a5b6ea347b9bfe56f654f8c320de52
font_01_sfnt_off00012440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12440 11600 bytes
SHA-256: 5740ad3f7b720d50cebdd2f26a30c2942f587306fbeb4679bcda1133acc9ea21
font_02_sfnt_off00014bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC9 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7

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