Malicious PDF — malware analysis report

Static analysis result for SHA-256 1450a9a0cca37fdf…

MALICIOUS

PDF

44.5 KB Created: 2020-03-22 09:10:18 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 90c40c4d284466f130688790806af6bd SHA-1: 8145db06608ec632355b1b6df85c0250d5eb0b7f SHA-256: 1450a9a0cca37fdfe77cac6ca5fc64784d8827e4b512e7cfc8bc44dad7e0a8eb
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are algorithmically generated and point to other PDF files. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve search engine rankings for malicious sites. No scripts were extracted, but the PDF structure and numerous external links suggest an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://bigcitylivin.com/uploads/1/3/0/4/130477003/130477003.html#recomendaciones+para+mejorar+la+practica+docente
    • http://hostmaster.pomeroywv.com/uploads/1/3/0/4/130490019/zodasuxo-wezijavu-lusovig-xopulinined.pdf
    • http://inaudiblepc.com/uploads/1/3/0/5/130544318/dokam.pdf
    • http://mwtreks.com/uploads/1/3/0/5/130590567/eb2a1f82f6e36be.pdf
    • http://oceansidehealing.com/uploads/1/3/0/3/130379411/xigatisas.pdf
    • http://autodiscover.aloenottingham.com/uploads/1/3/0/7/130775592/1384352.pdf
    • http://www.leeslawnmowerandsmallenginerepair.com/uploads/1/3/0/7/130738841/5f367.pdf
    • http://www.petsmart.com.ec/uploads/1/3/0/6/130621363/6b117398e67.pdf
    • http://www.besthistoricalfiction.com/uploads/1/3/0/7/130776657/9e600e9317dbc.pdf
    • http://www.swingtreegolf.com/uploads/1/3/0/6/130604631/85d20234.pdf
    • http://www.empowermilwaukee.org/uploads/1/3/0/4/130488820/096e10f0adf3.pdf
    • http://ww92.protrip.cz/uploads/1/3/0/6/130604240/zesipuzijat_viwitazu.pdf
    • http://buylegalservices.com/uploads/1/3/0/5/130544703/solex.pdf
    • http://www.turbo23.es/uploads/1/3/0/3/130323342/dukopamoretufoxaki.pdf
    • http://markculbertson.com/uploads/1/3/0/4/130488846/padeva.pdf
    • http://pagice.com/uploads/1/3/0/5/130550777/2891521.pdf
    • http://mbti.nuceritynow.com/uploads/1/3/0/4/130435725/fifokutawuzaj-dixidizix-jiguvefak-ziwarupev.pdf
    • http://ontrackrti.net/uploads/1/3/0/7/130776788/bawaseror-jefesexugopu-xegijorakaxuvu-serovupit.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_off00008016.bin
7cadb5d6cafb7c3e62f664e53215af4e713d59c40f1c4204ea4cf6c233d421e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8016 9816 bytes

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