Malicious PDF — malware analysis report

Static analysis result for SHA-256 100a141dba589f7d…

MALICIOUS

PDF

40.6 KB Created: 2020-04-02 20:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 49598c58de452c7d62cfecdc5b9776c3 SHA-1: f340b62328f5937c4dc1f0de025bc701b0c8df18 SHA-256: 100a141dba589f7de22ba77b0b9ba6b2cb308d132702ef0655d8b00c17aad128
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links to external domains, a technique often used for SEO spam or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to host or redirect to numerous other PDF files, likely for malicious purposes. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://lifesacredelements.com/uploads/1/3/0/5/130547846/130547846.html#ffxiv+house+purchase+timer
    • http://aidaradfar.com/uploads/1/3/0/6/130621940/5875693.pdf
    • http://cheryltesslersolitfoundation.com/uploads/1/3/0/6/130639950/0ba57d06e7fe93.pdf
    • http://oceancitybeachphotography.com/uploads/1/3/0/6/130621527/4b591.pdf
    • http://alphaguardprotection47.com/uploads/1/3/0/4/130476492/60f8d94b.pdf
    • http://dadynamicduo.com/uploads/1/3/0/6/130604616/59b4371fba9001.pdf
    • http://upstatevisualpropertyservices.net/uploads/1/3/1/1/131164499/nipazimeva.pdf
    • http://parseccommunications.com/uploads/1/3/0/7/130738666/jekolidurav.pdf
    • http://overthetopeventsne.com/uploads/1/3/0/4/130436519/jijewoxomu-zevarizem.pdf
    • http://elementsartsstudio.com/uploads/1/3/0/9/130969362/duwonugutu_femux.pdf
    • http://astroxmarketing.com/uploads/1/3/0/5/130540788/lanofo.pdf
    • http://faswer.space/uploads/1/3/0/7/130739155/a5b1409e.pdf
    • http://wachusetthomeinspection.com/uploads/1/3/0/4/130483561/xisegonimowopo-kawupusawivi-junog.pdf
    • http://lorieformonroe.com/uploads/1/3/0/6/130621963/1f5bd0a66.pdf
    • http://supportingfriend.online/uploads/1/3/0/5/130590059/nawaz.pdf
    • http://feedersarchery.com/uploads/1/3/0/2/130271154/xowumakiro-zeximawakow-sulopu-letodibe.pdf
    • http://linsayblondeau.com/uploads/1/3/0/3/130379172/wumalopusiduxivuso.pdf
    • http://tinosfamilyrestaurant.com/uploads/1/3/0/2/130272330/0ea3dbc.pdf
    • http://nomadicwellness.com/uploads/1/3/0/7/130775969/mumipowego-xenowowazuled-makozitemizafi.pdf
    • http://mckinzys.com/uploads/1/3/0/4/130476572/4195994.pdf
    • http://pioneerbenefits.com/uploads/1/3/0/5/130545565/damatezawomaz.pdf
    • http://katrinaplamondon.com/uploads/1/3/0/7/130775342/numux_xobanolumaxa_wirukomaxuzed.pdf
    • http://norwegianwoodworks.net/uploads/1/3/0/2/130271209/wigerirukun_pelazegob_lawexafegogaro_xapasapeloveze.pdf
    • http://jawsmarine.net/uploads/1/3/0/4/130489350/vulima-xunigator-guzif-jokaje.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_off0000778f.bin
e421f2803d6adaa616fa29974f0b2d3b9c87375b619696021eff71a44c74afdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x778F 7480 bytes

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