Malicious PDF — malware analysis report

Static analysis result for SHA-256 71262849fdd4f33b…

MALICIOUS

PDF

48.3 KB Created: 2020-04-02 03:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 73451fb707d484405291d1890063580f SHA-1: d18b4fc163b26ca7315a3bcc60cf4ffe41a5940c SHA-256: 71262849fdd4f33b14ec261c3ec2652b048a80e568308281b577639d795734c3
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to other PDF files with algorithmically generated names. This suggests a link farm or SEO manipulation tactic, or potentially a method to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of numerous external links.

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://mazaraicatering.com/uploads/1/3/1/4/131483025/131483025.html#textos+persuasivos+para+ni%C3%B1os+de+primaria
    • http://bealegacybuilder.com/uploads/1/3/0/4/130483765/xumegitigilibiduw.pdf
    • http://threeonabbott.com/uploads/1/3/0/6/130640019/zedezejaj-nunojosejowa-lezaxitirijabit.pdf
    • http://karenreber.com/uploads/1/3/0/5/130544034/8650167.pdf
    • http://performingartsculturalexchange.org/uploads/1/3/0/7/130740266/tijubivowuwotut-ponotisuwujo-lidet.pdf
    • http://ajluxarts.com/uploads/1/3/0/7/130740466/8897770.pdf
    • http://warthogmarinellc.com/uploads/1/3/0/3/130324351/9f9fb6c1a47.pdf
    • http://studentworshipcollective.com/uploads/1/3/0/6/130639282/bomexeliromopufed.pdf
    • http://mdptechs.com/uploads/1/3/0/7/130775741/futabe-jepuvezosaneva-tesemo.pdf
    • http://kefaloniaholidaysvilla.com/uploads/1/3/0/9/130969966/sejuginuwita.pdf
    • http://crystalpierbaitandtackle.net/uploads/1/3/0/2/130270953/loxuvatobusigep.pdf
    • http://maxretirementnow.com/uploads/1/3/0/5/130589103/xolatufepepan_vuxeju_lezizuninamewej.pdf
    • http://glojo25.com/uploads/1/3/0/8/130813765/697d9796be.pdf
    • http://ageekitchenandbath.com/uploads/1/3/0/5/130589171/voxov-fusurirugo-livafazu.pdf
    • http://estragonllc.com/uploads/1/3/0/7/130740050/4877058.pdf
    • http://cuculeathercompany.com/uploads/1/3/0/9/130969917/5956e.pdf
    • http://adaptivedesignnorthcarolina.com/uploads/1/3/0/9/130969645/1356711.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007be1.bin
b6b406b242049fa4745f5eeddff1b85ab8a03c752163606006136cebb8a0922c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE1 8968 bytes
font_01_sfnt_off00009c5b.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C5B 16036 bytes

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