Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8f6630e3d91450…

MALICIOUS

PDF

44.0 KB Created: 2020-04-01 14:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e2ae7a05302dfe74efeda5c9f72d3e83 SHA-1: dee44b643e1a2a19677eb80d659358edde0feef0 SHA-256: 7a8f6630e3d914507cf839b477c973dcd64a3a03da70891877d741981e036b12
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are structured in a way that suggests SEO spam or a link farm. The document body, though partially corrupted, indicates a lure related to a 'sample lesson plan'. The presence of numerous embedded URLs points towards an attempt to redirect users to potentially malicious content or phishing sites. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

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://liteclear12flagstaff.com/uploads/1/3/0/5/130590395/130590395.html#sample+lesson+plan+in+tle+nail+care
    • http://derringerfamily.com/uploads/1/3/0/3/130313309/badewiloguji_nonevuga_xunomu.pdf
    • http://grownmoney.org/uploads/1/3/0/2/130289735/jumuxisajolego.pdf
    • http://chiclen.com/uploads/1/3/0/6/130604411/kijuruwisuxili.pdf
    • http://partyanimalphotography.com/uploads/1/3/0/5/130550823/nedoguloji.pdf
    • http://cmenclosures.com/uploads/1/3/1/1/131164473/vajafu.pdf
    • http://scrub-hub.com/uploads/1/3/0/8/130874639/5608646.pdf
    • http://killerkilburn.com/uploads/1/3/1/4/131438167/ad0e3.pdf
    • http://rangimoleni.com/uploads/1/3/1/4/131437378/gozuxasoxixojix.pdf
    • http://firefighterfinancialservices.net/uploads/1/3/0/6/130639107/910014f8a4053.pdf
    • http://deermommy.com/uploads/1/3/0/5/130588407/zazoxaziwilekules.pdf
    • http://catherinecgt163.com/uploads/1/3/0/2/130270936/c144bee.pdf
    • http://ziplyfe.com/uploads/1/3/1/3/131398453/fuwexi-lirava-jawixofo.pdf
    • http://bowaterhomes.com/uploads/1/3/0/7/130740493/sogawelif-sixidowa.pdf
    • http://maritimeaxis.com/uploads/1/3/1/1/131163514/jenuriz.pdf
    • http://elijahrosario.co/uploads/1/3/0/2/130291040/nolimi.pdf
    • http://nwasuzukistrings.com/uploads/1/3/0/7/130740249/27fe157c0.pdf
    • http://oakleykambel.com/uploads/1/3/0/2/130288502/7416066.pdf
    • http://squarebusinessconstruction.com/uploads/1/3/0/7/130776826/21c531.pdf
    • http://eleganthustler.net/uploads/1/3/0/6/130620916/vepoguraxizizozetuf.pdf
    • http://robertjthomasphd.com/uploads/1/3/0/6/130604386/mosusulol.pdf
    • http://projetosengenharia.net/uploads/1/3/0/8/130874437/vavipapidajobege.pdf
    • http://lmlongoriginal.net/uploads/1/3/1/3/131381302/lonesitozebidalo.pdf
    • http://directimpingement.com/uploads/1/3/0/5/130550700/94c7f9.pdf
    • http://elmacaronintrepido.com/uploads/1/3/0/7/130740086/fazurufasola_nepev.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_off00008313.bin
0521245ce08a368da6761b548887d1d17a0f7cd253fcde0883d8dad65c1f12e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8313 7968 bytes

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