Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d72766af7a9621…

MALICIOUS

PDF

53.2 KB Created: 2020-03-21 22:04:51 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2ebcb38ad4565acf328aa75b090d2328 SHA-1: fa7568d7bc11e5b0a2c4f0b448dbaaec29711428 SHA-256: 12d72766af7a9621967a23113485cda0277eadd1585f8e1f8817d744c261ef0e
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDF files hosted on various domains. This technique is often used for SEO manipulation or to distribute malicious payloads. While no scripts were explicitly extracted, the PDF structure and the extensive link farm suggest a malicious intent to redirect users to potentially harmful content. The ML classifier also strongly indicated maliciousness.

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://chronichemps.com/uploads/1/3/0/2/130288552/130288552.html#staphylococcus+aureus+en+agar+sangre
    • http://sheepontheright.com/uploads/1/3/0/7/130738730/dubipe.pdf
    • http://m.trainingsolutionsinternational.com/uploads/1/3/0/9/130969149/wuzigezojijasasi.pdf
    • http://dennishdwyercarpentry.com/uploads/1/3/0/7/130740128/zobuzubulize.pdf
    • http://marquetteavenue.com/uploads/1/3/0/7/130775387/c61d91e895.pdf
    • http://medicalplasticmolding.net/uploads/1/3/0/5/130539842/3144581.pdf
    • http://usedcarsfortrade.com/uploads/1/3/0/2/130289580/sunobor_zatul_xumus.pdf
    • http://annaferrissimpson.com/uploads/1/3/0/7/130775529/5091563.pdf
    • http://www.pg-nda.com/uploads/1/3/0/6/130604215/2268301.pdf
    • http://dovernewlife.org/uploads/1/3/0/7/130775835/4daa57a5e7.pdf
    • http://saraabercrombie.com/uploads/1/3/0/2/130289179/5588360.pdf
    • http://www.jbrowneartist.com/uploads/1/3/0/8/130874064/4935023.pdf
    • http://ngundua.info/uploads/1/3/0/7/130776718/pabuwagal_remerogug_jixazivop.pdf
    • http://www.makeupbylilit.com/uploads/1/3/0/4/130488304/b65215aec661dce.pdf
    • http://whimsicalwinsomes.com/uploads/1/3/0/6/130639019/fedavosuf.pdf
    • http://hostmaster.sonetta.de/uploads/1/3/0/5/130542822/kizizabuxij.pdf
    • http://amybournephotography.com/uploads/1/3/0/7/130775726/fatubesake-kejorudamikakat.pdf
    • http://evaforsane.com/uploads/1/3/0/6/130620772/76d91193fba2239.pdf
    • http://3mdentallab.com/uploads/1/3/0/8/130814248/db98bea.pdf
    • http://www.mesayokearthworks.com/uploads/1/3/0/2/130288522/lugodiberagamifive.pdf
    • http://aspiringafricans.org/uploads/1/3/0/5/130551324/lapabifomasuxowa.pdf
    • http://nonqmrefinance.com/uploads/1/3/0/7/130775446/kidedilo.pdf
    • http://www.dennyhomes.com/uploads/1/3/0/9/130969817/1574099.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009ad2.bin
68661638662ad7f8d058c38d4b939d47a7000415442317f0dc21902f7e080d3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AD2 8388 bytes
font_01_sfnt_off0000ba49.bin
9ea54935d53598998e5fef336d9b67a5b6b32ec95de8d6782611390f29316c5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA49 3536 bytes

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