Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1b4fde22a98797…

MALICIOUS

PDF

45.8 KB Created: 2020-05-16 12:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 6123d202b45f313838d9c2734a00e621 SHA-1: 6032da39798f57065f9c0061d9c528e7e049fce7 SHA-256: ca1b4fde22a9879787f3b5af3a8b9f8c103e2292a468b7105049761a8a6d3e7c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body also contains some of these URLs, suggesting a lure to a link farm. The primary goal appears to be directing users to these external resources, which could be for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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 http://zachzorba.com/uploads/1/3/0/6/130639373/130639373.html#big+data+analysis+darshan+pdf PDF link annotation
    • http://musicvibes.info/uploads/1/3/0/7/130775965/07357.pdfIn PDF document text
    • http://theadeckersschilderen.com/uploads/1/3/0/3/130379170/manepenakefomojugepo.pdfIn PDF document text
    • http://webtuksportal.com/uploads/1/3/0/5/130547969/c61965464b9a3.pdfIn PDF document text
    • http://frcophthcourse.com/uploads/1/3/0/6/130620406/392a9f922f1329.pdfIn PDF document text
    • http://colorinthegray.com/uploads/1/3/0/3/130323293/94a335d92f.pdfIn PDF document text
    • http://stars-serve.org/uploads/1/3/0/6/130603896/1520095.pdfIn PDF document text
    • http://dorothymcphaul.com/uploads/1/3/0/2/130287296/jurexiwitosudadujo.pdfIn PDF document text
    • http://earlofgoat.com/uploads/1/3/0/7/130776571/eae678a.pdfIn PDF document text
    • http://integrityresearchconsulting.com/uploads/1/3/0/6/130620874/8875041.pdfIn PDF document text
    • http://hopectrnj.org/uploads/1/3/0/6/130621337/kibumez_doguwufolagefid_pawavazitiro_virup.pdfIn PDF document text
    • http://thaitogether.org/uploads/1/3/1/3/131384286/tenojil.pdfIn PDF document text
    • http://myvirtualbookkeeper.org/uploads/1/3/0/8/130874179/5031845.pdfIn PDF document text
    • http://willowcreeksub.com/uploads/1/3/1/6/131607278/3b9db15aebef3e1.pdfIn PDF document text
    • http://christinawinslow.org/uploads/1/3/1/8/131859527/vodemudubuta.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB2 2320 bytes
SHA-256: 7bb91423d63eb6bd7c2657278979848d60b7d38679106ec23dbd755ba6ab3d32
font_01_sfnt_off00006602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6602 10856 bytes
SHA-256: 14de2bad6e0ec6116bd8a24405ce45669ba254b24edf76b77d5d604e8720e280
font_02_sfnt_off00008af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF1 16224 bytes
SHA-256: 5f3bf50395e8d1b65f29ab90a426c3665da69f8437ae50e88eef237d5e22552a
font_03_sfnt_off0000a078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA078 2552 bytes
SHA-256: 93ea25c681757f5ecfb1397acd51771df61d8fb521f0098371eba7056f1aa2f2

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