Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7a1d2448f44aea…

MALICIOUS

PDF

43.7 KB Created: 2020-03-25 13:11:03 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 919bca38db1c220b1b3b1127ac3084f4 SHA-1: 3e82da8d66f4a6377ac3dd90de789f23af2c5955 SHA-256: 0b7a1d2448f44aea4248d9c06e1a8a6c918af1b61abbe876a11fb795b7ba2d01
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified as a link farm, pointing to various PDF files hosted on unrelated domains. This suggests an attempt to manipulate search engine results or distribute malicious content through these external links. The ML classifier also strongly indicated maliciousness.

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://bwsinvestments.com/uploads/1/3/0/5/130543476/130543476.html#how+to+make+a+paper+cube+template
    • http://andersonmobilehomepark.com/uploads/1/3/0/6/130604129/kokivawaxi.pdf
    • http://www.solmobilemassage.com/uploads/1/3/0/5/130539022/6e06ad7b23.pdf
    • http://northcountrysuggieshop.com/uploads/1/3/0/6/130620268/398f78.pdf
    • http://morphsparchd.com/uploads/1/3/0/7/130776445/56b69e2.pdf
    • http://bcvailvacation.com/uploads/1/3/0/7/130740080/e8a831ee518.pdf
    • http://oldtownpublic.com/uploads/1/3/0/6/130603874/6f69ac1153e.pdf
    • http://jlrecycling.org/uploads/1/3/0/6/130621282/kagupa_dofufabunati_medagumo_pefexe.pdf
    • http://www.puriri-wiltshire.co.nz/uploads/1/3/0/7/130740151/mejorupelera-mitaledireganid-bebazawenopaku-bulukuti.pdf
    • http://www.the1st6weeks.com/uploads/1/3/0/3/130324419/8498832.pdf
    • http://www.avvocatiperidirittiumani.org/uploads/1/3/0/6/130605065/9048664ef9b9f.pdf
    • http://evelyne.realtor/uploads/1/3/0/7/130738837/2530325.pdf
    • http://cortlandcatholic.org/uploads/1/3/0/7/130739222/zewafim_xovuwirum.pdf
    • http://truckwingsdev.com/uploads/1/3/0/4/130477036/1295992.pdf
    • http://www.ladycougarsoccer.com/uploads/1/3/0/8/130814200/74ee73d2a.pdf
    • http://mycorporatecounselor.com/uploads/1/3/0/6/130620840/gezebamaxezutuzasudi.pdf
    • http://dfyinggravity.com/uploads/1/3/0/4/130476513/lemaravugujan.pdf
    • http://black-ink-group.com/uploads/1/3/0/7/130738657/8348272.pdf
    • http://lettherebedance.com/uploads/1/3/0/2/130270898/godedumo.pdf
    • http://www.beechfieldestate.com/uploads/1/3/0/2/130272629/joxere_daburatemit.pdf
    • http://4wheelsand1home.org/uploads/1/3/0/8/130813609/c3b57de9872.pdf
    • http://sclerallensstl.com/uploads/1/3/0/3/130313026/tegalogos_popexu.pdf
    • http://drdonnabeckerantiaging.com/uploads/1/3/0/2/130287817/difuz.pdf
    • http://alohahairnmakeupbygg.com/uploads/1/3/0/5/130588277/wezupupegake.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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007863.bin
d7a9440947d861a2cb91824d8a674cecf4ac686b38b80d0838b87c971b32245b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7863 7904 bytes
font_01_sfnt_off00009736.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9736 2616 bytes

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