Malicious PDF — malware analysis report

Static analysis result for SHA-256 612483b2c07d3c26…

MALICIOUS

PDF

47.1 KB Created: 2020-04-01 17:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 83775990bed5a2bf008ef421f18f680c SHA-1: 0bbdd22ea16d11b0b57ef35f3f5dc482d2e86555 SHA-256: 612483b2c07d3c2655feb98caba327791b96db795f875bcf24b1010a961ec4fb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, detected by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded document body text, while appearing to be educational material, is likely a lure to disguise the malicious intent of directing users to numerous external PDF files.

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://sadiths.com/uploads/1/3/0/8/130874533/130874533.html#ejercicios+de+completar+palabras+para+ni%C3%B1os+de+preescolar
    • http://wfhaysfamilymedicine.com/uploads/1/3/0/8/130874671/jajadobaz-migedivorifaf-dugonuwibu.pdf
    • http://oneworldjustfortoday.com/uploads/1/3/1/0/131070841/kutivaf.pdf
    • http://lubeauty.co/uploads/1/3/1/1/131163535/tedavute.pdf
    • http://www.applesandbooks.com/uploads/1/3/0/2/130289204/bozegumot.pdf
    • http://southsidedavis.com/uploads/1/3/0/7/130776196/305f4ed.pdf
    • http://lillyzoo.net/uploads/1/3/1/3/131382118/2719280.pdf
    • http://ladychic.ca/uploads/1/3/1/3/131381109/bafexajame.pdf
    • http://paperowlpress.com/uploads/1/3/1/4/131409546/1236713.pdf
    • http://rossconstuctiongc.com/uploads/1/3/0/3/130379104/rujejudavetov.pdf
    • http://brightzone.net/uploads/1/3/0/5/130546096/gajalozuxub.pdf
    • http://toursofcalifornia.com/uploads/1/3/0/4/130488370/ab62cffd.pdf
    • http://edwardjamesblakely.com/uploads/1/3/1/1/131164117/pinamodarofipe-mabubapu-vusozagufugawu-najetoxot.pdf
    • http://onthisdayinplay.com/uploads/1/3/0/7/130775729/sivaxobok-rower.pdf
    • http://crewrealestate.net/uploads/1/3/0/5/130540072/rolilejita.pdf
    • http://vb-3design.com/uploads/1/3/0/6/130621447/3200440.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008bcb.bin
5dd3a2099253611c2e9c9994ca098197aa3263acff2613c94d62cd22d54b9985		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BCB 8976 bytes

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