Malicious PDF — malware analysis report

Static analysis result for SHA-256 55512e7f77b1381b…

MALICIOUS

PDF

53.8 KB Created: 2020-03-31 09:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c6e2fcd9764efeb6e6d82b4028da6fcf SHA-1: 2c631cf11969f2747519301ec9db7004a522d940 SHA-256: 55512e7f77b1381bc8cbb09a705a6db4c6bc814b2aa44e9a5a5719ce6918117d
94 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, a technique often used for SEO spam or to redirect users to malicious sites. The PDF_SEO_LINK_FARM heuristic firing confirms the presence of a mass external link farm. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample, but the sheer volume of outbound links suggests a delivery mechanism for further compromise.

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://artworkbycaiti.com/uploads/1/3/0/5/130551001/130551001.html#actividades+de+motricidad+gruesa+para+ni%C3%B1os+de+0+a+1+a%C3%B1o
    • http://simonehart.com/uploads/1/3/0/9/130969878/8816433.pdf
    • http://voxtw.com/uploads/1/3/0/2/130272501/tofuraradavel_fesijiferuja_kazedopote_revokap.pdf
    • http://trappedheart.com/uploads/1/3/0/5/130543166/rozonoriwej-bugalekusebax-nijekudetitode-tipifafiteke.pdf
    • http://apeacefullpassing.com/uploads/1/3/0/7/130739445/gaxipero.pdf
    • http://marie-louphotography.com/uploads/1/3/0/6/130639165/3064994.pdf
    • http://acupointgem.com/uploads/1/3/0/4/130492229/fekepitidik.pdf
    • http://mococonsulting.com/uploads/1/3/0/7/130776861/3f47041c0fb7110.pdf
    • http://themusiciansplayground.org/uploads/1/3/0/6/130603827/36ecb23.pdf
    • http://clicknimage.com/uploads/1/3/0/6/130639803/e7cc8eab12c920.pdf
    • http://gtopdesign.com/uploads/1/3/0/3/130323515/473699.pdf
    • http://mvhsphotography.com/uploads/1/3/0/7/130775755/kakizabop.pdf
    • http://4land.vip/uploads/1/3/0/5/130546024/32828ba9f3d4d.pdf
    • http://cannaole.com/uploads/1/3/1/4/131409210/gijulapedi.pdf
    • http://graysmathemagicians.com/uploads/1/3/0/4/130435843/c1674545ac.pdf
    • http://hard76.com/uploads/1/3/0/6/130620439/4612289.pdf
    • http://moodreap.com/uploads/1/3/0/6/130621938/domexus.pdf
    • http://randallfamilycounseling.org/uploads/1/3/1/0/131070651/a658f35.pdf
    • http://maxxdbxx.com/uploads/1/3/0/4/130435909/dumogin.pdf
    • http://adornbyjen.com/uploads/1/3/0/6/130604466/6b21f7.pdf
    • http://synergybusinessware.com/uploads/1/3/0/8/130814120/7f0c5d8.pdf
    • http://kindspiration.com/uploads/1/3/0/4/130490584/1735352.pdf
    • http://striplingeducation508.org/uploads/1/3/0/6/130639426/makixama_jofawira.pdf
    • http://dinata.com/uploads/1/3/0/9/130969176/pugaliralebewuw-jebajitozeka-zuten-jijevoforuwub.pdf
    • http://sportsmanianc.com/uploads/1/3/0/6/130604182/janelas.pdf
    • http://betterqualifiedblog.com/uploads/1/3/0/3/130379315/60fd56209a8a.pdf
    • http://sportsmanianc.com/uploads/1/3/
    • 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_off000091af.bin
ba1ae5ebb184eb646a6a69c25c4e6846702c35be48b32dd9adb431f9a18e649a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91AF 8676 bytes
font_01_sfnt_off0000b149.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB149 16036 bytes

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