Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ebf7375ce9c4d3…

MALICIOUS

PDF

43.4 KB Created: 2020-03-29 02:32:11 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-07
MD5: aff36f17ccbb309ded57247e03d3d20d SHA-1: 7153f40cbe4599d3cbf666982b85dc9e87595913 SHA-256: 40ebf7375ce9c4d3160c71ab8899d92b188059785eccaa8f2f4a8acd11554b27
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious. It contains a large number of external links, indicating a link farm or redirection scheme designed to lead users to potentially harmful content. The presence of numerous PDF links suggests an attempt to manipulate search engine results or distribute further malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://adsl-63-204-18-4.benefitplans.org/uploads/1/3/0/4/130488584/130488584.html#lao+sze+chuan+chicago+il+60616 PDF link annotation
    • http://apartmentsinwilkesboro.com/uploads/1/3/0/6/130639508/7469184.pdfIn PDF document text
    • http://www.gospeldrops.org/uploads/1/3/0/7/130776047/d63d2.pdfIn PDF document text
    • http://dressmeupmg.com/uploads/1/3/0/6/130603737/5705798.pdfIn PDF document text
    • http://joybiet.com/uploads/1/3/0/4/130483412/41220e84.pdfIn PDF document text
    • http://lopan.net/uploads/1/3/0/5/130551656/pewuw.pdfIn PDF document text
    • http://donnguyenknives.com/uploads/1/3/0/2/130292125/1078078.pdfIn PDF document text
    • http://narskuttelu.net/uploads/1/3/0/8/130813330/6520900.pdfIn PDF document text
    • http://oakhillcontractorsllc.net/uploads/1/3/0/6/130621500/fd5d01.pdfIn PDF document text
    • http://1123rd.com/uploads/1/3/0/2/130270898/02130d184f3ffd.pdfIn PDF document text
    • http://hostmaster.designedbyjpp.co.uk/uploads/1/3/0/2/130289530/267922be0.pdfIn PDF document text
    • http://sejasurpreendente.com/uploads/1/3/0/5/130589317/sodolobotuko_wutoxekup_rudugotokabalej_niwomi.pdfIn PDF document text
    • http://www.slipintoit.com/uploads/1/3/0/8/130874620/nogitofejagunofepefe.pdfIn PDF document text
    • http://mycofieny.com/uploads/1/3/0/7/130776716/2157278.pdfIn PDF document text
    • http://mta-sts.mail.hippopassion.com/uploads/1/3/0/5/130588490/zefezoxifuvavurewim.pdfIn PDF document text
    • http://theodoreskye.com/uploads/1/3/0/3/130313253/pumokelojepugo-kavubipufobo-jevateteronarub-gazoxifubuwoto.pdfIn PDF document text
    • http://www.youvswild.co.nz/uploads/1/3/0/8/130813750/buwazopinifotifebe.pdfIn PDF document text
    • http://lifeback.org.au/uploads/1/3/0/7/130739264/wetiw.pdfIn PDF document text
    • http://graceacresvenue.com/uploads/1/3/0/7/130776308/58ab6a0da3acee1.pdfIn PDF document text
    • http://www.timbertracehomeinspections.com/uploads/1/3/0/3/130323213/ce3ed2718f18dd6.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://www.adobe.com/).NotoIn PDF document text
    • http://www.google.com/get/noto/http://www.adobe.com/type/ThisIn PDF document text
    • http://scripts.sil.org/OFLNotoIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66CD 8360 bytes
SHA-256: ce3d8a33e6d5655d1a94e764f8379bfe7172ac6bc0644a9d77d1e8727b1d8193
font_01_sfnt_off000086fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86FC 7860 bytes
SHA-256: 22ad5a8dbe0ec64df3a7fc9ca3846211a556323626c220d4aeaea6e558372abc