Malicious PDF — malware analysis report

Static analysis result for SHA-256 05bc42b2cff1917c…

MALICIOUS

PDF

42.6 KB Created: 2020-03-16 10:04:26 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b7deb2e81f4be9fd4ed95184a629b216 SHA-1: e7372f3462a7294b6ee29008432373dce3eeca38 SHA-256: 05bc42b2cff1917c24188ac41c5edbe0c0934a0cfecbee0e7f72bd44bd4568e3
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are structured to appear as educational content like worksheets. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm or SEO spam operation. The embedded URLs are likely used to redirect users to malicious sites for phishing or malware distribution.

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://2fey9h.salon225.com/uploads/1/3/0/8/130813979/130813979.html#consonant+blends+worksheet+grade+3
    • http://www.ancoatsdeli.com/uploads/1/3/0/6/130621915/210f45446e85f.pdf
    • http://vb-052.interviewstudio.com/uploads/1/3/0/3/130323342/684276.pdf
    • http://newnoiseguitars.net/uploads/1/3/0/2/130272260/6354251.pdf
    • http://linabaz.com/uploads/1/3/0/9/130969003/dirawax-vagexusunij-vereso.pdf
    • http://kcgatorclub.com/uploads/1/3/0/5/130551057/kalugotagam_jinidanoderi_rejunexarofese.pdf
    • http://www.lt-vacations.com/uploads/1/3/0/6/130604632/sifenafag-kufavisebepara-bubozukoxamat.pdf
    • http://www.modernjeetkunedo.com/uploads/1/3/0/3/130313002/sagopaw-bisomesum-gefef.pdf
    • http://www.thebetterlifeflipbookstore.com/uploads/1/3/0/6/130622091/4b2c47.pdf
    • http://purgatoirevalleyfoundation.org/uploads/1/3/0/6/130604582/rovedu-regamevev-lumoduboj.pdf
    • http://bboom.space/uploads/1/3/0/3/130312983/6211286.pdf
    • http://www.akkijyrkka.com/uploads/1/3/0/7/130775166/7d622fcd3.pdf
    • http://jhoskins.online/uploads/1/3/0/6/130604452/xerarowa.pdf
    • http://suejardin.studio/uploads/1/3/0/5/130547613/f86bc39bb.pdf
    • http://theorchar.com/uploads/1/3/0/7/130739879/bazotatowomem-tewigi-xovoxivexaxosa.pdf
    • http://thebosna.com/uploads/1/3/0/7/130740033/dakidajewojemonir.pdf
    • http://sachkiretkaur.com/uploads/1/3/0/8/130813381/6432832.pdf
    • http://advisorlawyers.com/uploads/1/3/0/6/130621461/6865435.pdf
    • http://www.sellmyhempbiomass.com/uploads/1/3/0/5/130550655/wodunop_miwiwomerumiv_kosexuna_dikukidus.pdf
    • http://www.sahloulenterprises.com/uploads/1/3/0/5/130588290/9292206.pdf
    • http://shanleighhair.com/uploads/1/3/0/3/130379902/jubajavaxomotoxet.pdf
    • http://wilmingtonil-oakwood.com/uploads/1/3/0/5/130550809/punidixunu.pdf
    • http://www.openarmsmarket.com/uploads/1/3/0/7/130738943/rupafe.pdf
    • http://chapmanfarrellgroup.com/uploads/1/3/0/4/130435872/lazadulovurevijorob.pdf
    • http://visaforturkey.com/uploads/1/3/0/6/130620451/wokibibevogip-zudopuka-gipatuxikoziki-tepitavajilu.pdf
    • http://www.flying20.org/uploads/1/3/0/5/130551962/9179227.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_off00007bae.bin
355ea8200856e052065bf03e588fed92423cc73325a4fc564140b89569798c25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BAE 7972 bytes

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