Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b6c7ac1d8af061…

MALICIOUS

PDF

50.6 KB Created: 2020-03-26 05:24:11 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0e33e646cc9268fe204f06f17ce594af SHA-1: e0d41254e4dea65ddb6c18eb41c5bc32daef5b3f SHA-256: b3b6c7ac1d8af061c1418554453946fad0595d88d8919f99cc1c200c6d4854b4
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to uniquely named PDF files on different domains. This pattern is indicative of a link farm or SEO spam campaign, often used to redirect traffic or host malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the extensive link farm suggests a delivery or redirection mechanism.

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://mydontuknowwhoiam.com/uploads/1/3/0/3/130313015/130313015.html#propane+gas+fireplaces+at+lowes
    • http://acouturelife.com/uploads/1/3/0/6/130621873/gogek_kixuredixuror_tizonomiwidapuf.pdf
    • http://modtone.net/uploads/1/3/0/5/130544230/5815785.pdf
    • http://butleronthebluff.com/uploads/1/3/0/5/130543093/0e892a6481be3e3.pdf
    • http://jeanbarberia.com/uploads/1/3/0/5/130588403/334682.pdf
    • http://analyticalinstrumentservicecompany.com/uploads/1/3/0/5/130540240/rabilo.pdf
    • http://inside-the-distance.net/uploads/1/3/0/4/130483512/lisofuzusixapef-jijedamisuso.pdf
    • http://richmondmonuments.com/uploads/1/3/0/4/130483645/rozexubotadudokag.pdf
    • http://micisty.com.au/uploads/1/3/0/4/130435791/7817387.pdf
    • http://volunteer.beyondbarsanimalrescue.org/uploads/1/3/0/7/130775189/9934977.pdf
    • http://www.enscarved.com/uploads/1/3/0/6/130604136/kudawajok-giruzirawowaxem.pdf
    • http://districtmotorsport.com/uploads/1/3/0/2/130289429/monijikemulukip-porukemip-panepeledofeme-nudipavunopixi.pdf
    • http://missionexcell.com/uploads/1/3/0/7/130776688/xubovev.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000088a0.bin
eeca4c63841bda692baf2ab984b54d3cf3227e821b096f03c4c6ff73a11e48a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88A0 8060 bytes
font_01_sfnt_off0000a7db.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7DB 16204 bytes

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