Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f33432b1518bb7…

MALICIOUS

PDF

56.6 KB Created: 2020-04-26 19:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f66e3f061bbd5e63bce936d2246c2989 SHA-1: 313f67b8b36470b68392a5edb447f6427589a759 SHA-256: 42f33432b1518bb7752dd61629d34695a9616c4361a72fb871a0ec752f3c711e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which are to similarly structured URLs on different domains, indicating a link farm or SEO spamming technique. One of the primary links, 'http://bloodblisterapparel.com/uploads/1/3/1/0/131071288/131071288.html#free+music+to+phone+samsung', suggests a lure for users interested in free music downloads. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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://bloodblisterapparel.com/uploads/1/3/1/0/131071288/131071288.html#free+music+to+phone+samsung
    • http://celebratinggodscreation.org/uploads/1/3/0/2/130270833/kavafupa.pdf
    • http://thefloweroflife.world/uploads/1/3/0/6/130620716/zuwilofowemi_nomagegozejog.pdf
    • http://blacksheepgiftsandhomedecor.com/uploads/1/3/0/6/130603825/buxetenul_refora_josid.pdf
    • http://hummingbirdlaneorganicvapes.org/uploads/1/3/1/4/131437061/3450445.pdf
    • http://lynghaugblondehoney.com/uploads/1/3/1/4/131438510/zipetipige-bepopajemoxafip.pdf
    • http://barrowseventing.com/uploads/1/3/1/4/131438067/nebijagonida.pdf
    • http://carrollswenson-roberts.com/uploads/1/3/1/4/131408397/nafubolisokosow.pdf
    • http://richardsonlegalpllc.com/uploads/1/3/0/7/130776630/titaxelojosukus_lakimed_pibotixinugula_zokapulerugum.pdf
    • http://focalpointlabsllc.com/uploads/1/3/1/4/131482819/pezifikobewupomatika.pdf
    • http://hardhathomeinspection.com/uploads/1/3/0/6/130604031/a9384c.pdf
    • http://westcoastbalance.com/uploads/1/3/1/4/131413951/dowax.pdf
    • http://fullcirclehaven.com/uploads/1/3/0/6/130621108/ef4dfe15a1.pdf
    • http://realdatasolutions.org/uploads/1/3/0/4/130476798/ranajume.pdf
    • http://matttreppel.com/uploads/1/3/0/3/130323513/fobusixujuwoja-welakesipazi-pipegutojebax-dagozisavumoril.pdf
    • http://scope-for-growth.com/uploads/1/3/0/6/130621698/c9b81399a1.pdf
    • http://thefloweroflife.world/u
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009e43.bin
aaa3b190c636cc01f3702ac5571c230891ddcd99d43aab8d2be6dcd57c7e6a3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E43 8920 bytes
font_01_sfnt_off0000c078.bin
a9db9e52c430ce84153c098f3dc0349dbaef4fda65727381965c08ac14c0d273
pdf-font-stream PDF embedded font (sfnt) at offset 0xC078 16232 bytes