Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c1e58382241bb0…

MALICIOUS

PDF

43.5 KB Created: 2020-03-27 02:24:21 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4a885a6c5819ba6cf20a9e7a90d7336d SHA-1: 028103c5f26222a686e7cc01a043b6bebee2d602 SHA-256: 11c1e58382241bb04f02db71641e3a212899c7ccab145f5a54c99ae8e54eb59b
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, suggesting a malicious intent to direct users to potentially harmful content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this assessment. While no scripts were explicitly extracted, the structure and numerous external links are indicative of a phishing or SEO manipulation scheme.

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://djspizza1.com/uploads/1/3/0/5/130550664/130550664.html#convert+3.5+monsters+to+5e
    • http://www.patriciarenna.net/uploads/1/3/0/3/130323311/183939.pdf
    • http://mta-sts.blindowlharmonicas.com/uploads/1/3/0/7/130740210/8733202.pdf
    • http://www.puttylove.com/uploads/1/3/1/0/131070294/toxatas.pdf
    • http://low-carbohydrate-food-guide.com/uploads/1/3/0/8/130874269/tatoretewimuxov-kavebiluguzix-donejon-nosezejujusavi.pdf
    • http://leanprograms.com/uploads/1/3/0/9/130969329/wajulumudejuf.pdf
    • http://emixmusic.com/uploads/1/3/0/4/130489001/letela_sejobe.pdf
    • http://evernightmoon.com/uploads/1/3/0/5/130543293/rasule.pdf
    • http://lexiseduasia.com/uploads/1/3/0/6/130620951/kitetafij-dukuvoronelen-nobuge-siburufudok.pdf
    • http://www.freemasoninfo.com/uploads/1/3/0/5/130547812/471d9e9c7.pdf
    • http://mrsreid3rdgrade.com/uploads/1/3/0/6/130604423/mirorukulas_namotop.pdf
    • http://gilbertocrombe.com/uploads/1/3/0/6/130621421/43f50084.pdf
    • http://pioneerhandbook.com/uploads/1/3/0/4/130477605/pilizusipudinesawi.pdf
    • http://brianedennison.org/uploads/1/3/0/5/130589397/a34d648.pdf
    • http://mentorconcrete.com/uploads/1/3/0/7/130776891/sekarapulipuk.pdf
    • http://silk777.net/uploads/1/3/0/6/130639333/lukibijuno.pdf
    • http://brownbabybrigade.org/uploads/1/3/0/5/130543320/tojodiwotuzom.pdf
    • http://fencecompanyfortworth.com/uploads/1/3/0/8/130874305/najun.pdf
    • http://myjesustalk.com/uploads/1/3/0/5/130589103/c2a56a83e469.pdf
    • http://www.haymanholidays.com/uploads/1/3/0/8/130874217/lukakimudamuw.pdf
    • http://aviplan.net/uploads/1/3/1/1/131163957/9accefc.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_off00007ec5.bin
4b9cc1993c53320d1420eba44f3f8d821a856fa7bbf5a11601ffd251c6d20dc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC5 8484 bytes

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