Malicious PDF — malware analysis report

Static analysis result for SHA-256 59835c98d659f093…

MALICIOUS

PDF

38.0 KB Created: 2020-03-14 18:49:25 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c59723804fe75630dc944f6431c1bc66 SHA-1: 636c242ecc0d1f6a9f2e30c201e9dc4fbd619f85 SHA-256: 59835c98d659f0930288e893d6a241f153bfb8a5955baf008df1f1e2f42344bd
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which are numerically or generically named and hosted on unrelated domains, indicating a link farm or SEO poisoning tactic. One of the embedded links, 'http://74-123-75-206.mgwnet.com/uploads/1/3/0/7/130775462/130775462.html#pridestaff+timesheet+login', suggests a lure for a timesheet login. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for phishing or to redirect users to malicious content.

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://74-123-75-206.mgwnet.com/uploads/1/3/0/7/130775462/130775462.html#pridestaff+timesheet+login
    • http://deanirious.com/uploads/1/3/0/4/130435781/7700713.pdf
    • http://mx.antiqueneworleans.com/uploads/1/3/0/8/130813533/1178200.pdf
    • http://yourkstspot.com/uploads/1/3/0/7/130776060/17967.pdf
    • http://mr-monticello.com/uploads/1/3/0/6/130639546/rojedajod.pdf
    • http://dentalstudentportal.com/uploads/1/3/0/7/130775698/0ba19b018769.pdf
    • http://drmargointhehouse.net/uploads/1/3/0/5/130547078/311e199be21f4.pdf
    • http://www.smokeylanefarms.com/uploads/1/3/0/4/130483364/pogigu_pofaxizumebudat_firaxun_wusotilubuke.pdf
    • http://ezmusiconhold.com/uploads/1/3/0/6/130604645/165c3420619c439.pdf
    • http://appartementverhuur.com/uploads/1/3/0/4/130483345/rexazuluzo.pdf
    • http://fightintheshade.net/uploads/1/3/0/5/130541402/gefixosifoligujol.pdf
    • http://nsngames.com/uploads/1/3/0/6/130639428/7020459.pdf
    • http://inspiredweddingshowcase.com/uploads/1/3/0/6/130640109/webupufef-najika-renoli.pdf
    • http://savonfraiche.com/uploads/1/3/0/4/130477663/pofinakore-sadozo-pelubat-josodetabinas.pdf
    • http://spaz-tech.com/uploads/1/3/0/2/130291507/bd84c25aee56.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_off00006c34.bin
09e14e070edd3f5d8e50d01552ff19a98c86b77c470faab6eedbddb3c02c1fef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C34 8052 bytes

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