Malicious PDF — malware analysis report

Static analysis result for SHA-256 c153f65672e3344c…

MALICIOUS

PDF

73.4 KB Created: 2021-03-15 23:43:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0e5c4437a0f7a9ec76271ff0e7848c6c SHA-1: 309b828fbc28e142abd50e1fdacc7e0a4a29a3ee SHA-256: c153f65672e3344c7097c6a16da81bd3ae470c9c760dd2b2bbc6578f9e201bc3
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 link farm, suggesting a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=when+should+you+plant+red+onions PDF link annotation
    • https://wirejosesem.weebly.com/uploads/1/3/1/8/131856641/jowusul-fezazuvajagufi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496404/normal_5fca2a10d2df2.pdfIn PDF document text
    • https://tobakegerikudo.weebly.com/uploads/1/3/1/4/131482881/giburi.pdfIn PDF document text
    • https://vogapixafaroge.weebly.com/uploads/1/3/4/2/134234717/6905160.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373779/normal_5fdc4746247d3.pdfIn PDF document text
    • https://lizameguxif.weebly.com/uploads/1/3/1/6/131606128/vaguxozenibuka_bisukatidosa_sopusewowelejoz.pdfIn PDF document text
    • https://silavetej.weebly.com/uploads/1/3/5/3/135314504/274d8e132454.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/najubu/big_data_analytics_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51fb368d-8224-4b2a-90bd-bea664f5399a/xegobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df902084-eae7-4268-b70a-d13660dbed4e/biomedical_engineering_bridging_medicine_and_technology.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/6796435082.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/dodegibifo.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/adiga_adiga_naa_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/18192780327.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e6780b0-b13a-4ea8-9ea4-d6b5c787cd5e/88826532234.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fab620f-0ba7-406d-a399-6787ffcc4f10/the_chronicles_of_narnia_3_full_movie_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06d3521f-16d1-43ef-9156-c8639ac502cf/63881652950.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/vubij.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_off0000e24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24D 5164 bytes
SHA-256: 8db600edec0dd2d4c2ba8a09c429f62b0ead00e14ce97d871f0eb0df47363800
font_01_sfnt_off0000f3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E4 10992 bytes
SHA-256: b41151e5cb25d756ef125f7c6ed4af10fc59031008c22b88ccbaf190060b10a4

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