Malicious PDF — malware analysis report

Static analysis result for SHA-256 b317b988a9fabd61…

MALICIOUS

PDF

57.6 KB Created: 2020-04-21 01:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: a2805a577c25006862832194314dc6aa SHA-1: 277d9339f457f2307d65689f6a52c3787f9b3910 SHA-256: b317b988a9fabd618d4df7a3c1ffd58f4a6e091552a3530d8710d8369407a6c1
104 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO abuse tactic. The document body, though partially corrupted, contains text related to an 'answer key', which is a common lure for phishing or malware distribution. The presence of multiple external URIs and the PDF_SEO_LINK_FARM heuristic strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hoffmannmotorcycles.com/uploads/1/3/0/4/130489359/130489359.html#answer+key+lab+assistant+2016+rajasthan PDF link annotation
    • http://mrspsela.com/uploads/1/3/0/6/130639152/8543737.pdfIn PDF document text
    • http://asatisled.com/uploads/1/3/1/0/131069904/tebituperowumix.pdfIn PDF document text
    • http://adventureswiththebartels.com/uploads/1/3/0/5/130589095/b7df3710b8d9f92.pdfIn PDF document text
    • http://fieldstone-park.com/uploads/1/3/0/6/130604416/3131698.pdfIn PDF document text
    • http://danaetakesphotos.com/uploads/1/3/0/3/130324044/2183693.pdfIn PDF document text
    • http://relaxandcraftit.com/uploads/1/3/0/2/130270885/e8131bf.pdfIn PDF document text
    • http://meridenoilcompany.com/uploads/1/3/1/4/131406115/texofudan_mosedej_wubepezorevar.pdfIn PDF document text
    • http://americanmemorialpark.org/uploads/1/3/0/7/130740571/rozipoxexebas.pdfIn PDF document text
    • http://kalaya-emu-estates.com/uploads/1/3/0/5/130551073/795182dab59c9c4.pdfIn PDF document text
    • http://cool-it.org/uploads/1/3/1/4/131438068/1b0bd387d.pdfIn PDF document text
    • http://interactivegamesales.com/uploads/1/3/0/7/130740512/cf86583ba4c8.pdfIn PDF document text
    • http://rsmssb.in.EnterIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C18 8552 bytes
SHA-256: b372eaf8abc385543c46d886e3c19c2ea7816e82a7f216f9b3094ae473558963
font_01_sfnt_off0000ace2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACE2 1388 bytes
SHA-256: 1723f1ced37cc89d69e30f3df6281c5e5fb8989544fd4587aa75b00c91af2fd0
font_02_sfnt_off0000b448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB448 12896 bytes
SHA-256: 33a922a9a03f1a75310a58b584b99cc7d15d3f25726c8cb6bca83dc99040e0af

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