Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ac622c711f5f45…

MALICIOUS

PDF

48.4 KB Created: 2020-05-24 12:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5da67560a2fd8762b926f82e5b601d96 SHA-1: 238ff17fecded3d50e663859cc9569132371d134 SHA-256: 19ac622c711f5f45d75d04ca759c5fdbd914930fe2699ebafa3813276c98335a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF document contains a heuristic firing for a 'PDF_SEO_LINK_FARM' indicating a large number of external PDF links. The embedded URLs and the document body confirm this, pointing to numerous PDF files hosted on various domains. This suggests a tactic to manipulate search engine results or distribute malicious content indirectly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://webmail.yoginidani.com/uploads/1/3/0/7/130775150/130775150.html#libro+dise%25C3%25B1o+curricular+frida+d
    • http://squirreldogwalking.com/uploads/1/3/0/7/130739983/kuzodijovoli_rolarenof_samazoku_rumigogamovev.pdf
    • http://action-appliance-installation.net/uploads/1/3/0/6/130604222/4144350.pdf
    • http://dmmotosports.com/uploads/1/3/0/7/130739328/3bbff21b639.pdf
    • http://wimbexpo.com/uploads/1/3/0/6/130639563/8cd5743ecd21b.pdf
    • http://gardenbuildingsurrey.com/uploads/1/3/0/7/130776358/tubesigurexejexotir.pdf
    • http://pacificcoastvisions.com/uploads/1/3/0/6/130605254/1138363.pdf
    • http://pucktalks.com/uploads/1/3/0/7/130740357/b8e893.pdf
    • http://niacurriculum.com/uploads/1/3/0/5/130550805/7543182.pdf
    • http://virtstaff.com/uploads/1/3/0/6/130639456/nalufirefu.pdf
    • http://privacy-update.com/uploads/1/3/0/9/130969939/disilipitedizatele.pdf
    • http://sacaravan.com/uploads/1/3/1/0/131070434/talal_solofeminajonow_daloturotifit_xomelosuxi.pdf
    • http://souloshe.com/uploads/1/3/0/6/130604850/6582c14d218.pdf
    • http://pandttech.com/uploads/1/3/0/6/130603903/sexodosarulu.pdf
    • http://1bi.undesirable.us/uploads/1/3/0/6/130639693/2600045.pdf
    • http://alpineaircare.com/uploads/1/3/0/6/130604749/8864175.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008dbc.bin
0b9c40f32722b12f715202475674a0c89b806e466150fd3d7050edfdb81f4c46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DBC 12360 bytes

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